1 files changed, 156 insertions, 71 deletions

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 3141e149d595..30963af5dba0 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -30,6 +30,7 @@
 
 #include <asm/ptrace.h>
 #include <asm/irq.h>
+#include <asm/idle.h>
 #include <asm/sync_bitops.h>
 #include <asm/xen/hypercall.h>
 #include <asm/xen/hypervisor.h>
@@ -51,27 +52,43 @@ static DEFINE_PER_CPU(int, virq_to_irq[NR_VIRQS]) = {[0 ... NR_VIRQS-1] = -1};
 /* IRQ <-> IPI mapping */
 static DEFINE_PER_CPU(int, ipi_to_irq[XEN_NR_IPIS]) = {[0 ... XEN_NR_IPIS-1] = -1};
 
-/* Packed IRQ information: binding type, sub-type index, and event channel. */
-struct packed_irq
-{
-        unsigned short evtchn;
-        unsigned char index;
-        unsigned char type;
-};
-
-static struct packed_irq irq_info[NR_IRQS];
-
-/* Binding types. */
-enum {
-        IRQT_UNBOUND,
+/* Interrupt types. */
+enum xen_irq_type {
+        IRQT_UNBOUND = 0,
         IRQT_PIRQ,
         IRQT_VIRQ,
         IRQT_IPI,
         IRQT_EVTCHN
 };
 
-/* Convenient shorthand for packed representation of an unbound IRQ. */
-#define IRQ_UNBOUND     mk_irq_info(IRQT_UNBOUND, 0, 0)
+/*
+ * Packed IRQ information:
+ * type - enum xen_irq_type
+ * event channel - irq->event channel mapping
+ * cpu - cpu this event channel is bound to
+ * index - type-specific information:
+ *    PIRQ - vector, with MSB being "needs EIO"
+ *    VIRQ - virq number
+ *    IPI - IPI vector
+ *    EVTCHN -
+ */
+struct irq_info
+{
+        enum xen_irq_type type; /* type */
+        unsigned short evtchn;  /* event channel */
+        unsigned short cpu;     /* cpu bound */
+
+        union {
+                unsigned short virq;
+                enum ipi_vector ipi;
+                struct {
+                        unsigned short gsi;
+                        unsigned short vector;
+                } pirq;
+        } u;
+};
+
+static struct irq_info irq_info[NR_IRQS];
 
 static int evtchn_to_irq[NR_EVENT_CHANNELS] = {
         [0 ... NR_EVENT_CHANNELS-1] = -1
@@ -84,10 +101,6 @@ static inline unsigned long *cpu_evtchn_mask(int cpu)
 {
         return cpu_evtchn_mask_p[cpu].bits;
 }
-static u8 cpu_evtchn[NR_EVENT_CHANNELS];
-
-/* Reference counts for bindings to IRQs. */
-static int irq_bindcount[NR_IRQS];
 
 /* Xen will never allocate port zero for any purpose. */
 #define VALID_EVTCHN(chn)       ((chn) != 0)
@@ -95,27 +108,108 @@ static int irq_bindcount[NR_IRQS];
 static struct irq_chip xen_dynamic_chip;
 
 /* Constructor for packed IRQ information. */
-static inline struct packed_irq mk_irq_info(u32 type, u32 index, u32 evtchn)
+static struct irq_info mk_unbound_info(void)
+{
+        return (struct irq_info) { .type = IRQT_UNBOUND };
+}
+
+static struct irq_info mk_evtchn_info(unsigned short evtchn)
+{
+        return (struct irq_info) { .type = IRQT_EVTCHN, .evtchn = evtchn,
+                        .cpu = 0 };
+}
+
+static struct irq_info mk_ipi_info(unsigned short evtchn, enum ipi_vector ipi)
+{
+        return (struct irq_info) { .type = IRQT_IPI, .evtchn = evtchn,
+                        .cpu = 0, .u.ipi = ipi };
+}
+
+static struct irq_info mk_virq_info(unsigned short evtchn, unsigned short virq)
 {
-        return (struct packed_irq) { evtchn, index, type };
+        return (struct irq_info) { .type = IRQT_VIRQ, .evtchn = evtchn,
+                        .cpu = 0, .u.virq = virq };
+}
+
+static struct irq_info mk_pirq_info(unsigned short evtchn,
+                                    unsigned short gsi, unsigned short vector)
+{
+        return (struct irq_info) { .type = IRQT_PIRQ, .evtchn = evtchn,
+                        .cpu = 0, .u.pirq = { .gsi = gsi, .vector = vector } };
 }
 
 /*
  * Accessors for packed IRQ information.
  */
-static inline unsigned int evtchn_from_irq(int irq)
+static struct irq_info *info_for_irq(unsigned irq)
 {
-        return irq_info[irq].evtchn;
+        return &irq_info[irq];
 }
 
-static inline unsigned int index_from_irq(int irq)
+static unsigned int evtchn_from_irq(unsigned irq)
 {
-        return irq_info[irq].index;
+        return info_for_irq(irq)->evtchn;
 }
 
-static inline unsigned int type_from_irq(int irq)
+static enum ipi_vector ipi_from_irq(unsigned irq)
 {
-        return irq_info[irq].type;
+        struct irq_info *info = info_for_irq(irq);
+
+        BUG_ON(info == NULL);
+        BUG_ON(info->type != IRQT_IPI);
+
+        return info->u.ipi;
+}
+
+static unsigned virq_from_irq(unsigned irq)
+{
+        struct irq_info *info = info_for_irq(irq);
+
+        BUG_ON(info == NULL);
+        BUG_ON(info->type != IRQT_VIRQ);
+
+        return info->u.virq;
+}
+
+static unsigned gsi_from_irq(unsigned irq)
+{
+        struct irq_info *info = info_for_irq(irq);
+
+        BUG_ON(info == NULL);
+        BUG_ON(info->type != IRQT_PIRQ);
+
+        return info->u.pirq.gsi;
+}
+
+static unsigned vector_from_irq(unsigned irq)
+{
+        struct irq_info *info = info_for_irq(irq);
+
+        BUG_ON(info == NULL);
+        BUG_ON(info->type != IRQT_PIRQ);
+
+        return info->u.pirq.vector;
+}
+
+static enum xen_irq_type type_from_irq(unsigned irq)
+{
+        return info_for_irq(irq)->type;
+}
+
+static unsigned cpu_from_irq(unsigned irq)
+{
+        return info_for_irq(irq)->cpu;
+}
+
+static unsigned int cpu_from_evtchn(unsigned int evtchn)
+{
+        int irq = evtchn_to_irq[evtchn];
+        unsigned ret = 0;
+
+        if (irq != -1)
+                ret = cpu_from_irq(irq);
+
+        return ret;
 }
 
 static inline unsigned long active_evtchns(unsigned int cpu,
@@ -136,10 +230,10 @@ static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
         cpumask_copy(irq_to_desc(irq)->affinity, cpumask_of(cpu));
 #endif
 
-        __clear_bit(chn, cpu_evtchn_mask(cpu_evtchn[chn]));
+        __clear_bit(chn, cpu_evtchn_mask(cpu_from_irq(irq)));
         __set_bit(chn, cpu_evtchn_mask(cpu));
 
-        cpu_evtchn[chn] = cpu;
+        irq_info[irq].cpu = cpu;
 }
 
 static void init_evtchn_cpu_bindings(void)
@@ -154,15 +248,9 @@ static void init_evtchn_cpu_bindings(void)
         }
 #endif
 
-        memset(cpu_evtchn, 0, sizeof(cpu_evtchn));
         memset(cpu_evtchn_mask(0), ~0, sizeof(cpu_evtchn_mask(0)));
 }
 
-static inline unsigned int cpu_from_evtchn(unsigned int evtchn)
-{
-        return cpu_evtchn[evtchn];
-}
-
 static inline void clear_evtchn(int port)
 {
         struct shared_info *s = HYPERVISOR_shared_info;
@@ -240,9 +328,8 @@ static int find_unbound_irq(void)
         int irq;
         struct irq_desc *desc;
 
-        /* Only allocate from dynirq range */
         for (irq = 0; irq < nr_irqs; irq++)
-                if (irq_bindcount[irq] == 0)
+                if (irq_info[irq].type == IRQT_UNBOUND)
                         break;
 
         if (irq == nr_irqs)
@@ -252,6 +339,8 @@ static int find_unbound_irq(void)
         if (WARN_ON(desc == NULL))
                 return -1;
 
+        dynamic_irq_init(irq);
+
         return irq;
 }
 
@@ -266,16 +355,13 @@ int bind_evtchn_to_irq(unsigned int evtchn)
         if (irq == -1) {
                 irq = find_unbound_irq();
 
-                dynamic_irq_init(irq);
                 set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
                                               handle_level_irq, "event");
 
                 evtchn_to_irq[evtchn] = irq;
-                irq_info[irq] = mk_irq_info(IRQT_EVTCHN, 0, evtchn);
+                irq_info[irq] = mk_evtchn_info(evtchn);
         }
 
-        irq_bindcount[irq]++;
-
         spin_unlock(&irq_mapping_update_lock);
 
         return irq;
@@ -290,12 +376,12 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
         spin_lock(&irq_mapping_update_lock);
 
         irq = per_cpu(ipi_to_irq, cpu)[ipi];
+
         if (irq == -1) {
                 irq = find_unbound_irq();
                 if (irq < 0)
                         goto out;
 
-                dynamic_irq_init(irq);
                 set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
                                               handle_level_irq, "ipi");
 
@@ -306,15 +392,12 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
                 evtchn = bind_ipi.port;
 
                 evtchn_to_irq[evtchn] = irq;
-                irq_info[irq] = mk_irq_info(IRQT_IPI, ipi, evtchn);
-
+                irq_info[irq] = mk_ipi_info(evtchn, ipi);
                 per_cpu(ipi_to_irq, cpu)[ipi] = irq;
 
                 bind_evtchn_to_cpu(evtchn, cpu);
         }
 
-        irq_bindcount[irq]++;
-
  out:
         spin_unlock(&irq_mapping_update_lock);
         return irq;
@@ -340,20 +423,17 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
 
                 irq = find_unbound_irq();
 
-                dynamic_irq_init(irq);
                 set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
                                               handle_level_irq, "virq");
 
                 evtchn_to_irq[evtchn] = irq;
-                irq_info[irq] = mk_irq_info(IRQT_VIRQ, virq, evtchn);
+                irq_info[irq] = mk_virq_info(evtchn, virq);
 
                 per_cpu(virq_to_irq, cpu)[virq] = irq;
 
                 bind_evtchn_to_cpu(evtchn, cpu);
         }
 
-        irq_bindcount[irq]++;
-
         spin_unlock(&irq_mapping_update_lock);
 
         return irq;
@@ -366,7 +446,7 @@ static void unbind_from_irq(unsigned int irq)
 
         spin_lock(&irq_mapping_update_lock);
 
-        if ((--irq_bindcount[irq] == 0) && VALID_EVTCHN(evtchn)) {
+        if (VALID_EVTCHN(evtchn)) {
                 close.port = evtchn;
                 if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
                         BUG();
@@ -374,11 +454,11 @@ static void unbind_from_irq(unsigned int irq)
                 switch (type_from_irq(irq)) {
                 case IRQT_VIRQ:
                         per_cpu(virq_to_irq, cpu_from_evtchn(evtchn))
-                                [index_from_irq(irq)] = -1;
+                                [virq_from_irq(irq)] = -1;
                         break;
                 case IRQT_IPI:
                         per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
-                                [index_from_irq(irq)] = -1;
+                                [ipi_from_irq(irq)] = -1;
                         break;
                 default:
                         break;
@@ -388,7 +468,7 @@ static void unbind_from_irq(unsigned int irq)
                 bind_evtchn_to_cpu(evtchn, 0);
 
                 evtchn_to_irq[evtchn] = -1;
-                irq_info[irq] = IRQ_UNBOUND;
+                irq_info[irq] = mk_unbound_info();
 
                 dynamic_irq_cleanup(irq);
         }
@@ -506,8 +586,8 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
         for(i = 0; i < NR_EVENT_CHANNELS; i++) {
                 if (sync_test_bit(i, sh->evtchn_pending)) {
                         printk("  %d: event %d -> irq %d\n",
-                                cpu_evtchn[i], i,
-                                evtchn_to_irq[i]);
+                               cpu_from_evtchn(i), i,
+                               evtchn_to_irq[i]);
                 }
         }
 
@@ -516,7 +596,6 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
-
 /*
  * Search the CPUs pending events bitmasks.  For each one found, map
  * the event number to an irq, and feed it into do_IRQ() for
@@ -529,11 +608,15 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
 void xen_evtchn_do_upcall(struct pt_regs *regs)
 {
         int cpu = get_cpu();
+        struct pt_regs *old_regs = set_irq_regs(regs);
         struct shared_info *s = HYPERVISOR_shared_info;
         struct vcpu_info *vcpu_info = __get_cpu_var(xen_vcpu);
         static DEFINE_PER_CPU(unsigned, nesting_count);
         unsigned count;
 
+        exit_idle();
+        irq_enter();
+
         do {
                 unsigned long pending_words;
 
@@ -558,7 +641,7 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
                                 int irq = evtchn_to_irq[port];
 
                                 if (irq != -1)
-                                        xen_do_IRQ(irq, regs);
+                                        handle_irq(irq, regs);
                         }
                 }
 
@@ -569,12 +652,17 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
         } while(count != 1);
 
 out:
+        irq_exit();
+        set_irq_regs(old_regs);
+
         put_cpu();
 }
 
 /* Rebind a new event channel to an existing irq. */
 void rebind_evtchn_irq(int evtchn, int irq)
 {
+        struct irq_info *info = info_for_irq(irq);
+
         /* Make sure the irq is masked, since the new event channel
            will also be masked. */
         disable_irq(irq);
@@ -584,11 +672,11 @@ void rebind_evtchn_irq(int evtchn, int irq)
         /* After resume the irq<->evtchn mappings are all cleared out */
         BUG_ON(evtchn_to_irq[evtchn] != -1);
         /* Expect irq to have been bound before,
-           so the bindcount should be non-0 */
-        BUG_ON(irq_bindcount[irq] == 0);
+           so there should be a proper type */
+        BUG_ON(info->type == IRQT_UNBOUND);
 
         evtchn_to_irq[evtchn] = irq;
-        irq_info[irq] = mk_irq_info(IRQT_EVTCHN, 0, evtchn);
+        irq_info[irq] = mk_evtchn_info(evtchn);
 
         spin_unlock(&irq_mapping_update_lock);
 
@@ -698,8 +786,7 @@ static void restore_cpu_virqs(unsigned int cpu)
                 if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1)
                         continue;
 
-                BUG_ON(irq_info[irq].type != IRQT_VIRQ);
-                BUG_ON(irq_info[irq].index != virq);
+                BUG_ON(virq_from_irq(irq) != virq);
 
                 /* Get a new binding from Xen. */
                 bind_virq.virq = virq;
@@ -711,7 +798,7 @@ static void restore_cpu_virqs(unsigned int cpu)
 
                 /* Record the new mapping. */
                 evtchn_to_irq[evtchn] = irq;
-                irq_info[irq] = mk_irq_info(IRQT_VIRQ, virq, evtchn);
+                irq_info[irq] = mk_virq_info(evtchn, virq);
                 bind_evtchn_to_cpu(evtchn, cpu);
 
                 /* Ready for use. */
@@ -728,8 +815,7 @@ static void restore_cpu_ipis(unsigned int cpu)
                 if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1)
                         continue;
 
-                BUG_ON(irq_info[irq].type != IRQT_IPI);
-                BUG_ON(irq_info[irq].index != ipi);
+                BUG_ON(ipi_from_irq(irq) != ipi);
 
                 /* Get a new binding from Xen. */
                 bind_ipi.vcpu = cpu;
@@ -740,7 +826,7 @@ static void restore_cpu_ipis(unsigned int cpu)
 
                 /* Record the new mapping. */
                 evtchn_to_irq[evtchn] = irq;
-                irq_info[irq] = mk_irq_info(IRQT_IPI, ipi, evtchn);
+                irq_info[irq] = mk_ipi_info(evtchn, ipi);
                 bind_evtchn_to_cpu(evtchn, cpu);
 
                 /* Ready for use. */
@@ -820,8 +906,11 @@ void xen_irq_resume(void)
 
 static struct irq_chip xen_dynamic_chip __read_mostly = {
         .name           = "xen-dyn",
+
+        .disable        = disable_dynirq,
         .mask           = disable_dynirq,
         .unmask         = enable_dynirq,
+
         .ack            = ack_dynirq,
         .set_affinity   = set_affinity_irq,
         .retrigger      = retrigger_dynirq,
@@ -841,9 +930,5 @@ void __init xen_init_IRQ(void)
         for (i = 0; i < NR_EVENT_CHANNELS; i++)
                 mask_evtchn(i);
 
-        /* Dynamic IRQ space is currently unbound. Zero the refcnts. */
-        for (i = 0; i < nr_irqs; i++)
-                irq_bindcount[i] = 0;
-
         irq_ctx_init(smp_processor_id());
 }