8 files changed, 345 insertions, 34 deletions

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index a103732b7588..1cdfd09c8abc 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -95,6 +95,7 @@ typedef irqreturn_t (*irq_handler_t)(int, void *);
  * @flags:      flags (see IRQF_* above)
  * @name:       name of the device
  * @dev_id:     cookie to identify the device
+ * @percpu_dev_id:      cookie to identify the device
  * @next:       pointer to the next irqaction for shared interrupts
  * @irq:        interrupt number
  * @dir:        pointer to the proc/irq/NN/name entry
@@ -104,17 +105,18 @@ typedef irqreturn_t (*irq_handler_t)(int, void *);
  * @thread_mask:        bitmask for keeping track of @thread activity
  */
 struct irqaction {
-        irq_handler_t handler;
-        unsigned long flags;
-        void *dev_id;
-        struct irqaction *next;
-        int irq;
-        irq_handler_t thread_fn;
-        struct task_struct *thread;
-        unsigned long thread_flags;
-        unsigned long thread_mask;
-        const char *name;
-        struct proc_dir_entry *dir;
+        irq_handler_t           handler;
+        unsigned long           flags;
+        void                    *dev_id;
+        void __percpu           *percpu_dev_id;
+        struct irqaction        *next;
+        int                     irq;
+        irq_handler_t           thread_fn;
+        struct task_struct      *thread;
+        unsigned long           thread_flags;
+        unsigned long           thread_mask;
+        const char              *name;
+        struct proc_dir_entry   *dir;
 } ____cacheline_internodealigned_in_smp;
 
 extern irqreturn_t no_action(int cpl, void *dev_id);
@@ -136,6 +138,10 @@ extern int __must_check
 request_any_context_irq(unsigned int irq, irq_handler_t handler,
                         unsigned long flags, const char *name, void *dev_id);
 
+extern int __must_check
+request_percpu_irq(unsigned int irq, irq_handler_t handler,
+                   const char *devname, void __percpu *percpu_dev_id);
+
 extern void exit_irq_thread(void);
 #else
 
@@ -164,10 +170,18 @@ request_any_context_irq(unsigned int irq, irq_handler_t handler,
         return request_irq(irq, handler, flags, name, dev_id);
 }
 
+static inline int __must_check
+request_percpu_irq(unsigned int irq, irq_handler_t handler,
+                   const char *devname, void __percpu *percpu_dev_id)
+{
+        return request_irq(irq, handler, 0, devname, percpu_dev_id);
+}
+
 static inline void exit_irq_thread(void) { }
 #endif
 
 extern void free_irq(unsigned int, void *);
+extern void free_percpu_irq(unsigned int, void __percpu *);
 
 struct device;
 
@@ -207,7 +221,9 @@ extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
 
 extern void disable_irq_nosync(unsigned int irq);
 extern void disable_irq(unsigned int irq);
+extern void disable_percpu_irq(unsigned int irq);
 extern void enable_irq(unsigned int irq);
+extern void enable_percpu_irq(unsigned int irq);
 
 /* The following three functions are for the core kernel use only. */
 #ifdef CONFIG_GENERIC_HARDIRQS
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 73e31abeba1c..59e49c80cc2c 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -66,6 +66,7 @@ typedef	void (*irq_preflow_handler_t)(struct irq_data *data);
  * IRQ_NO_BALANCING             - Interrupt cannot be balanced (affinity set)
  * IRQ_MOVE_PCNTXT              - Interrupt can be migrated from process context
  * IRQ_NESTED_TRHEAD            - Interrupt nests into another thread
+ * IRQ_PER_CPU_DEVID            - Dev_id is a per-cpu variable
  */
 enum {
         IRQ_TYPE_NONE           = 0x00000000,
@@ -88,12 +89,13 @@ enum {
         IRQ_MOVE_PCNTXT         = (1 << 14),
         IRQ_NESTED_THREAD       = (1 << 15),
         IRQ_NOTHREAD            = (1 << 16),
+        IRQ_PER_CPU_DEVID       = (1 << 17),
 };
 
 #define IRQF_MODIFY_MASK        \
         (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
          IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
-         IRQ_PER_CPU | IRQ_NESTED_THREAD)
+         IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID)
 
 #define IRQ_NO_BALANCING_MASK   (IRQ_PER_CPU | IRQ_NO_BALANCING)
 
@@ -367,6 +369,8 @@ enum {
 struct irqaction;
 extern int setup_irq(unsigned int irq, struct irqaction *new);
 extern void remove_irq(unsigned int irq, struct irqaction *act);
+extern int setup_percpu_irq(unsigned int irq, struct irqaction *new);
+extern void remove_percpu_irq(unsigned int irq, struct irqaction *act);
 
 extern void irq_cpu_online(void);
 extern void irq_cpu_offline(void);
@@ -394,6 +398,7 @@ extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
 extern void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc);
 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
+extern void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc);
 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
 extern void handle_nested_irq(unsigned int irq);
 
@@ -422,6 +427,8 @@ static inline void irq_set_chip_and_handler(unsigned int irq, struct irq_chip *c
         irq_set_chip_and_handler_name(irq, chip, handle, NULL);
 }
 
+extern int irq_set_percpu_devid(unsigned int irq);
+
 extern void
 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
                   const char *name);
@@ -483,6 +490,13 @@ static inline void irq_set_nested_thread(unsigned int irq, bool nest)
                 irq_clear_status_flags(irq, IRQ_NESTED_THREAD);
 }
 
+static inline void irq_set_percpu_devid_flags(unsigned int irq)
+{
+        irq_set_status_flags(irq,
+                             IRQ_NOAUTOEN | IRQ_PER_CPU | IRQ_NOTHREAD |
+                             IRQ_NOPROBE | IRQ_PER_CPU_DEVID);
+}
+
 /* Handle dynamic irq creation and destruction */
 extern unsigned int create_irq_nr(unsigned int irq_want, int node);
 extern int create_irq(void);
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index 150134ac709a..6b69c2c9dff1 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -53,6 +53,7 @@ struct irq_desc {
         unsigned long           last_unhandled; /* Aging timer for unhandled count */
         unsigned int            irqs_unhandled;
         raw_spinlock_t          lock;
+        struct cpumask          *percpu_enabled;
 #ifdef CONFIG_SMP
         const struct cpumask    *affinity_hint;
         struct irq_affinity_notify *affinity_notify;
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index dc5114b4c16c..f7c543a801d9 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -26,7 +26,7 @@
 int irq_set_chip(unsigned int irq, struct irq_chip *chip)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 
         if (!desc)
                 return -EINVAL;
@@ -54,7 +54,7 @@ EXPORT_SYMBOL(irq_set_chip);
 int irq_set_irq_type(unsigned int irq, unsigned int type)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
         int ret = 0;
 
         if (!desc)
@@ -78,7 +78,7 @@ EXPORT_SYMBOL(irq_set_irq_type);
 int irq_set_handler_data(unsigned int irq, void *data)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 
         if (!desc)
                 return -EINVAL;
@@ -98,7 +98,7 @@ EXPORT_SYMBOL(irq_set_handler_data);
 int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 
         if (!desc)
                 return -EINVAL;
@@ -119,7 +119,7 @@ int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
 int irq_set_chip_data(unsigned int irq, void *data)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 
         if (!desc)
                 return -EINVAL;
@@ -204,6 +204,24 @@ void irq_disable(struct irq_desc *desc)
         }
 }
 
+void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
+{
+        if (desc->irq_data.chip->irq_enable)
+                desc->irq_data.chip->irq_enable(&desc->irq_data);
+        else
+                desc->irq_data.chip->irq_unmask(&desc->irq_data);
+        cpumask_set_cpu(cpu, desc->percpu_enabled);
+}
+
+void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
+{
+        if (desc->irq_data.chip->irq_disable)
+                desc->irq_data.chip->irq_disable(&desc->irq_data);
+        else
+                desc->irq_data.chip->irq_mask(&desc->irq_data);
+        cpumask_clear_cpu(cpu, desc->percpu_enabled);
+}
+
 static inline void mask_ack_irq(struct irq_desc *desc)
 {
         if (desc->irq_data.chip->irq_mask_ack)
@@ -544,12 +562,44 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
                 chip->irq_eoi(&desc->irq_data);
 }
 
+/**
+ * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
+ * @irq:        the interrupt number
+ * @desc:       the interrupt description structure for this irq
+ *
+ * Per CPU interrupts on SMP machines without locking requirements. Same as
+ * handle_percpu_irq() above but with the following extras:
+ *
+ * action->percpu_dev_id is a pointer to percpu variables which
+ * contain the real device id for the cpu on which this handler is
+ * called
+ */
+void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc)
+{
+        struct irq_chip *chip = irq_desc_get_chip(desc);
+        struct irqaction *action = desc->action;
+        void *dev_id = __this_cpu_ptr(action->percpu_dev_id);
+        irqreturn_t res;
+
+        kstat_incr_irqs_this_cpu(irq, desc);
+
+        if (chip->irq_ack)
+                chip->irq_ack(&desc->irq_data);
+
+        trace_irq_handler_entry(irq, action);
+        res = action->handler(irq, dev_id);
+        trace_irq_handler_exit(irq, action, res);
+
+        if (chip->irq_eoi)
+                chip->irq_eoi(&desc->irq_data);
+}
+
 void
 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
                   const char *name)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
 
         if (!desc)
                 return;
@@ -593,7 +643,7 @@ irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 
         if (!desc)
                 return;
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 6546431447d7..a73dd6c7372d 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -71,6 +71,8 @@ extern int irq_startup(struct irq_desc *desc);
 extern void irq_shutdown(struct irq_desc *desc);
 extern void irq_enable(struct irq_desc *desc);
 extern void irq_disable(struct irq_desc *desc);
+extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
+extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
 extern void mask_irq(struct irq_desc *desc);
 extern void unmask_irq(struct irq_desc *desc);
 
@@ -114,14 +116,21 @@ static inline void chip_bus_sync_unlock(struct irq_desc *desc)
                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 }
 
+#define _IRQ_DESC_CHECK         (1 << 0)
+#define _IRQ_DESC_PERCPU        (1 << 1)
+
+#define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
+#define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
+
 struct irq_desc *
-__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus);
+__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
+                    unsigned int check);
 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 
 static inline struct irq_desc *
-irq_get_desc_buslock(unsigned int irq, unsigned long *flags)
+irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
 {
-        return __irq_get_desc_lock(irq, flags, true);
+        return __irq_get_desc_lock(irq, flags, true, check);
 }
 
 static inline void
@@ -131,9 +140,9 @@ irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 }
 
 static inline struct irq_desc *
-irq_get_desc_lock(unsigned int irq, unsigned long *flags)
+irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
 {
-        return __irq_get_desc_lock(irq, flags, false);
+        return __irq_get_desc_lock(irq, flags, false, check);
 }
 
 static inline void
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 039b889ea053..1550e8447a16 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -424,11 +424,22 @@ unsigned int irq_get_next_irq(unsigned int offset)
 }
 
 struct irq_desc *
-__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus)
+__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
+                    unsigned int check)
 {
         struct irq_desc *desc = irq_to_desc(irq);
 
         if (desc) {
+                if (check & _IRQ_DESC_CHECK) {
+                        if ((check & _IRQ_DESC_PERCPU) &&
+                            !irq_settings_is_per_cpu_devid(desc))
+                                return NULL;
+
+                        if (!(check & _IRQ_DESC_PERCPU) &&
+                            irq_settings_is_per_cpu_devid(desc))
+                                return NULL;
+                }
+
                 if (bus)
                         chip_bus_lock(desc);
                 raw_spin_lock_irqsave(&desc->lock, *flags);
@@ -443,6 +454,25 @@ void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
                 chip_bus_sync_unlock(desc);
 }
 
+int irq_set_percpu_devid(unsigned int irq)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+
+        if (!desc)
+                return -EINVAL;
+
+        if (desc->percpu_enabled)
+                return -EINVAL;
+
+        desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
+
+        if (!desc->percpu_enabled)
+                return -ENOMEM;
+
+        irq_set_percpu_devid_flags(irq);
+        return 0;
+}
+
 /**
  * dynamic_irq_cleanup - cleanup a dynamically allocated irq
  * @irq:        irq number to initialize
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 7e1a3ed1e61a..7b4b156d065c 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -195,7 +195,7 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *mask)
 int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 
         if (!desc)
                 return -EINVAL;
@@ -356,7 +356,7 @@ void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
 static int __disable_irq_nosync(unsigned int irq)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 
         if (!desc)
                 return -EINVAL;
@@ -448,7 +448,7 @@ void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume)
 void enable_irq(unsigned int irq)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 
         if (!desc)
                 return;
@@ -491,7 +491,7 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on)
 int irq_set_irq_wake(unsigned int irq, unsigned int on)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
         int ret = 0;
 
         if (!desc)
@@ -532,7 +532,7 @@ EXPORT_SYMBOL(irq_set_irq_wake);
 int can_request_irq(unsigned int irq, unsigned long irqflags)
 {
         unsigned long flags;
-        struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+        struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
         int canrequest = 0;
 
         if (!desc)
@@ -1121,6 +1121,8 @@ int setup_irq(unsigned int irq, struct irqaction *act)
         int retval;
         struct irq_desc *desc = irq_to_desc(irq);
 
+        if (WARN_ON(irq_settings_is_per_cpu_devid(desc)))
+                return -EINVAL;
         chip_bus_lock(desc);
         retval = __setup_irq(irq, desc, act);
         chip_bus_sync_unlock(desc);
@@ -1129,7 +1131,7 @@ int setup_irq(unsigned int irq, struct irqaction *act)
 }
 EXPORT_SYMBOL_GPL(setup_irq);
 
- /*
+/*
  * Internal function to unregister an irqaction - used to free
  * regular and special interrupts that are part of the architecture.
  */
@@ -1227,7 +1229,10 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
  */
 void remove_irq(unsigned int irq, struct irqaction *act)
 {
-        __free_irq(irq, act->dev_id);
+        struct irq_desc *desc = irq_to_desc(irq);
+
+        if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc)))
+            __free_irq(irq, act->dev_id);
 }
 EXPORT_SYMBOL_GPL(remove_irq);
 
@@ -1249,7 +1254,7 @@ void free_irq(unsigned int irq, void *dev_id)
 {
         struct irq_desc *desc = irq_to_desc(irq);
 
-        if (!desc)
+        if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
                 return;
 
 #ifdef CONFIG_SMP
@@ -1327,7 +1332,8 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
         if (!desc)
                 return -EINVAL;
 
-        if (!irq_settings_can_request(desc))
+        if (!irq_settings_can_request(desc) ||
+            WARN_ON(irq_settings_is_per_cpu_devid(desc)))
                 return -EINVAL;
 
         if (!handler) {
@@ -1412,3 +1418,181 @@ int request_any_context_irq(unsigned int irq, irq_handler_t handler,
         return !ret ? IRQC_IS_HARDIRQ : ret;
 }
 EXPORT_SYMBOL_GPL(request_any_context_irq);
+
+void enable_percpu_irq(unsigned int irq)
+{
+        unsigned int cpu = smp_processor_id();
+        unsigned long flags;
+        struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
+
+        if (!desc)
+                return;
+
+        irq_percpu_enable(desc, cpu);
+        irq_put_desc_unlock(desc, flags);
+}
+
+void disable_percpu_irq(unsigned int irq)
+{
+        unsigned int cpu = smp_processor_id();
+        unsigned long flags;
+        struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
+
+        if (!desc)
+                return;
+
+        irq_percpu_disable(desc, cpu);
+        irq_put_desc_unlock(desc, flags);
+}
+
+/*
+ * Internal function to unregister a percpu irqaction.
+ */
+static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_id)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+        struct irqaction *action;
+        unsigned long flags;
+
+        WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
+
+        if (!desc)
+                return NULL;
+
+        raw_spin_lock_irqsave(&desc->lock, flags);
+
+        action = desc->action;
+        if (!action || action->percpu_dev_id != dev_id) {
+                WARN(1, "Trying to free already-free IRQ %d\n", irq);
+                goto bad;
+        }
+
+        if (!cpumask_empty(desc->percpu_enabled)) {
+                WARN(1, "percpu IRQ %d still enabled on CPU%d!\n",
+                     irq, cpumask_first(desc->percpu_enabled));
+                goto bad;
+        }
+
+        /* Found it - now remove it from the list of entries: */
+        desc->action = NULL;
+
+        raw_spin_unlock_irqrestore(&desc->lock, flags);
+
+        unregister_handler_proc(irq, action);
+
+        module_put(desc->owner);
+        return action;
+
+bad:
+        raw_spin_unlock_irqrestore(&desc->lock, flags);
+        return NULL;
+}
+
+/**
+ *      remove_percpu_irq - free a per-cpu interrupt
+ *      @irq: Interrupt line to free
+ *      @act: irqaction for the interrupt
+ *
+ * Used to remove interrupts statically setup by the early boot process.
+ */
+void remove_percpu_irq(unsigned int irq, struct irqaction *act)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+
+        if (desc && irq_settings_is_per_cpu_devid(desc))
+            __free_percpu_irq(irq, act->percpu_dev_id);
+}
+
+/**
+ *      free_percpu_irq - free an interrupt allocated with request_percpu_irq
+ *      @irq: Interrupt line to free
+ *      @dev_id: Device identity to free
+ *
+ *      Remove a percpu interrupt handler. The handler is removed, but
+ *      the interrupt line is not disabled. This must be done on each
+ *      CPU before calling this function. The function does not return
+ *      until any executing interrupts for this IRQ have completed.
+ *
+ *      This function must not be called from interrupt context.
+ */
+void free_percpu_irq(unsigned int irq, void __percpu *dev_id)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+
+        if (!desc || !irq_settings_is_per_cpu_devid(desc))
+                return;
+
+        chip_bus_lock(desc);
+        kfree(__free_percpu_irq(irq, dev_id));
+        chip_bus_sync_unlock(desc);
+}
+
+/**
+ *      setup_percpu_irq - setup a per-cpu interrupt
+ *      @irq: Interrupt line to setup
+ *      @act: irqaction for the interrupt
+ *
+ * Used to statically setup per-cpu interrupts in the early boot process.
+ */
+int setup_percpu_irq(unsigned int irq, struct irqaction *act)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+        int retval;
+
+        if (!desc || !irq_settings_is_per_cpu_devid(desc))
+                return -EINVAL;
+        chip_bus_lock(desc);
+        retval = __setup_irq(irq, desc, act);
+        chip_bus_sync_unlock(desc);
+
+        return retval;
+}
+
+/**
+ *      request_percpu_irq - allocate a percpu interrupt line
+ *      @irq: Interrupt line to allocate
+ *      @handler: Function to be called when the IRQ occurs.
+ *      @devname: An ascii name for the claiming device
+ *      @dev_id: A percpu cookie passed back to the handler function
+ *
+ *      This call allocates interrupt resources, but doesn't
+ *      automatically enable the interrupt. It has to be done on each
+ *      CPU using enable_percpu_irq().
+ *
+ *      Dev_id must be globally unique. It is a per-cpu variable, and
+ *      the handler gets called with the interrupted CPU's instance of
+ *      that variable.
+ */
+int request_percpu_irq(unsigned int irq, irq_handler_t handler,
+                       const char *devname, void __percpu *dev_id)
+{
+        struct irqaction *action;
+        struct irq_desc *desc;
+        int retval;
+
+        if (!dev_id)
+                return -EINVAL;
+
+        desc = irq_to_desc(irq);
+        if (!desc || !irq_settings_can_request(desc) ||
+            !irq_settings_is_per_cpu_devid(desc))
+                return -EINVAL;
+
+        action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
+        if (!action)
+                return -ENOMEM;
+
+        action->handler = handler;
+        action->flags = IRQF_PERCPU;
+        action->name = devname;
+        action->percpu_dev_id = dev_id;
+
+        chip_bus_lock(desc);
+        retval = __setup_irq(irq, desc, action);
+        chip_bus_sync_unlock(desc);
+
+        if (retval)
+                kfree(action);
+
+        return retval;
+}
diff --git a/kernel/irq/settings.h b/kernel/irq/settings.h
index f1667833d444..1162f1030f18 100644
--- a/kernel/irq/settings.h
+++ b/kernel/irq/settings.h
@@ -13,6 +13,7 @@ enum {
         _IRQ_MOVE_PCNTXT        = IRQ_MOVE_PCNTXT,
         _IRQ_NO_BALANCING       = IRQ_NO_BALANCING,
         _IRQ_NESTED_THREAD      = IRQ_NESTED_THREAD,
+        _IRQ_PER_CPU_DEVID      = IRQ_PER_CPU_DEVID,
         _IRQF_MODIFY_MASK       = IRQF_MODIFY_MASK,
 };
 
@@ -24,6 +25,7 @@ enum {
 #define IRQ_NOTHREAD            GOT_YOU_MORON
 #define IRQ_NOAUTOEN            GOT_YOU_MORON
 #define IRQ_NESTED_THREAD       GOT_YOU_MORON
+#define IRQ_PER_CPU_DEVID       GOT_YOU_MORON
 #undef IRQF_MODIFY_MASK
 #define IRQF_MODIFY_MASK        GOT_YOU_MORON
 
@@ -39,6 +41,11 @@ static inline bool irq_settings_is_per_cpu(struct irq_desc *desc)
         return desc->status_use_accessors & _IRQ_PER_CPU;
 }
 
+static inline bool irq_settings_is_per_cpu_devid(struct irq_desc *desc)
+{
+        return desc->status_use_accessors & _IRQ_PER_CPU_DEVID;
+}
+
 static inline void irq_settings_set_per_cpu(struct irq_desc *desc)
 {
         desc->status_use_accessors |= _IRQ_PER_CPU;