Merge remote-tracking branch 'rmk/devel-stable' into HEAD

4 files changed, 154 insertions, 12 deletions

diff --git a/include/linux/cpu_pm.h b/include/linux/cpu_pm.h
new file mode 100644
index 000000000000..455b233dd3b1
--- /dev/null
+++ b/include/linux/cpu_pm.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Author:
+ *      Colin Cross <ccross@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _LINUX_CPU_PM_H
+#define _LINUX_CPU_PM_H
+
+#include <linux/kernel.h>
+#include <linux/notifier.h>
+
+/*
+ * When a CPU goes to a low power state that turns off power to the CPU's
+ * power domain, the contents of some blocks (floating point coprocessors,
+ * interrupt controllers, caches, timers) in the same power domain can
+ * be lost.  The cpm_pm notifiers provide a method for platform idle, suspend,
+ * and hotplug implementations to notify the drivers for these blocks that
+ * they may be reset.
+ *
+ * All cpu_pm notifications must be called with interrupts disabled.
+ *
+ * The notifications are split into two classes: CPU notifications and CPU
+ * cluster notifications.
+ *
+ * CPU notifications apply to a single CPU and must be called on the affected
+ * CPU.  They are used to save per-cpu context for affected blocks.
+ *
+ * CPU cluster notifications apply to all CPUs in a single power domain. They
+ * are used to save any global context for affected blocks, and must be called
+ * after all the CPUs in the power domain have been notified of the low power
+ * state.
+ */
+
+/*
+ * Event codes passed as unsigned long val to notifier calls
+ */
+enum cpu_pm_event {
+        /* A single cpu is entering a low power state */
+        CPU_PM_ENTER,
+
+        /* A single cpu failed to enter a low power state */
+        CPU_PM_ENTER_FAILED,
+
+        /* A single cpu is exiting a low power state */
+        CPU_PM_EXIT,
+
+        /* A cpu power domain is entering a low power state */
+        CPU_CLUSTER_PM_ENTER,
+
+        /* A cpu power domain failed to enter a low power state */
+        CPU_CLUSTER_PM_ENTER_FAILED,
+
+        /* A cpu power domain is exiting a low power state */
+        CPU_CLUSTER_PM_EXIT,
+};
+
+#ifdef CONFIG_CPU_PM
+int cpu_pm_register_notifier(struct notifier_block *nb);
+int cpu_pm_unregister_notifier(struct notifier_block *nb);
+int cpu_pm_enter(void);
+int cpu_pm_exit(void);
+int cpu_cluster_pm_enter(void);
+int cpu_cluster_pm_exit(void);
+
+#else
+
+static inline int cpu_pm_register_notifier(struct notifier_block *nb)
+{
+        return 0;
+}
+
+static inline int cpu_pm_unregister_notifier(struct notifier_block *nb)
+{
+        return 0;
+}
+
+static inline int cpu_pm_enter(void)
+{
+        return 0;
+}
+
+static inline int cpu_pm_exit(void)
+{
+        return 0;
+}
+
+static inline int cpu_cluster_pm_enter(void)
+{
+        return 0;
+}
+
+static inline int cpu_cluster_pm_exit(void)
+{
+        return 0;
+}
+#endif
+#endif
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index a103732b7588..664544ff77d5 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, unsigned int type);
 
 /* 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 59517300a315..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)
 
@@ -336,12 +338,14 @@ struct irq_chip {
  * IRQCHIP_MASK_ON_SUSPEND:     Mask non wake irqs in the suspend path
  * IRQCHIP_ONOFFLINE_ENABLED:   Only call irq_on/off_line callbacks
  *                              when irq enabled
+ * IRQCHIP_SKIP_SET_WAKE:       Skip chip.irq_set_wake(), for this irq chip
  */
 enum {
         IRQCHIP_SET_TYPE_MASKED         = (1 <<  0),
         IRQCHIP_EOI_IF_HANDLED          = (1 <<  1),
         IRQCHIP_MASK_ON_SUSPEND         = (1 <<  2),
         IRQCHIP_ONOFFLINE_ENABLED       = (1 <<  3),
+        IRQCHIP_SKIP_SET_WAKE           = (1 <<  4),
 };
 
 /* This include will go away once we isolated irq_desc usage to core code */
@@ -365,6 +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);
@@ -392,6 +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);
 
@@ -420,6 +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);
@@ -481,6 +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;