Merge branch 'master' of /home/trondmy/kernel/linux-2.6/

1 files changed, 287 insertions, 83 deletions

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 676e00dfb21..b48eae32dc6 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -1,5 +1,5 @@
-#ifndef __irq_h
-#define __irq_h
+#ifndef _LINUX_IRQ_H
+#define _LINUX_IRQ_H
 
 /*
  * Please do not include this file in generic code.  There is currently
@@ -11,7 +11,7 @@
 
 #include <linux/smp.h>
 
-#if !defined(CONFIG_S390)
+#ifndef CONFIG_S390
 
 #include <linux/linkage.h>
 #include <linux/cache.h>
@@ -24,84 +24,172 @@
 
 /*
  * IRQ line status.
+ *
+ * Bits 0-16 are reserved for the IRQF_* bits in linux/interrupt.h
+ *
+ * IRQ types
  */
-#define IRQ_INPROGRESS	1	/* IRQ handler active - do not enter! */
-#define IRQ_DISABLED	2	/* IRQ disabled - do not enter! */
-#define IRQ_PENDING	4	/* IRQ pending - replay on enable */
-#define IRQ_REPLAY	8	/* IRQ has been replayed but not acked yet */
-#define IRQ_AUTODETECT	16	/* IRQ is being autodetected */
-#define IRQ_WAITING	32	/* IRQ not yet seen - for autodetection */
-#define IRQ_LEVEL	64	/* IRQ level triggered */
-#define IRQ_MASKED	128	/* IRQ masked - shouldn't be seen again */
-#if defined(ARCH_HAS_IRQ_PER_CPU)
-# define IRQ_PER_CPU	256	/* IRQ is per CPU */
+#define IRQ_TYPE_NONE		0x00000000	/* Default, unspecified type */
+#define IRQ_TYPE_EDGE_RISING	0x00000001	/* Edge rising type */
+#define IRQ_TYPE_EDGE_FALLING	0x00000002	/* Edge falling type */
+#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
+#define IRQ_TYPE_LEVEL_HIGH	0x00000004	/* Level high type */
+#define IRQ_TYPE_LEVEL_LOW	0x00000008	/* Level low type */
+#define IRQ_TYPE_SENSE_MASK	0x0000000f	/* Mask of the above */
+#define IRQ_TYPE_PROBE		0x00000010	/* Probing in progress */
+
+/* Internal flags */
+#define IRQ_INPROGRESS		0x00010000	/* IRQ handler active - do not enter! */
+#define IRQ_DISABLED		0x00020000	/* IRQ disabled - do not enter! */
+#define IRQ_PENDING		0x00040000	/* IRQ pending - replay on enable */
+#define IRQ_REPLAY		0x00080000	/* IRQ has been replayed but not acked yet */
+#define IRQ_AUTODETECT		0x00100000	/* IRQ is being autodetected */
+#define IRQ_WAITING		0x00200000	/* IRQ not yet seen - for autodetection */
+#define IRQ_LEVEL		0x00400000	/* IRQ level triggered */
+#define IRQ_MASKED		0x00800000	/* IRQ masked - shouldn't be seen again */
+#ifdef CONFIG_IRQ_PER_CPU
+# define IRQ_PER_CPU		0x01000000	/* IRQ is per CPU */
 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
 #else
 # define CHECK_IRQ_PER_CPU(var) 0
 #endif
 
-/*
- * Interrupt controller descriptor. This is all we need
- * to describe about the low-level hardware. 
+#define IRQ_NOPROBE		0x02000000	/* IRQ is not valid for probing */
+#define IRQ_NOREQUEST		0x04000000	/* IRQ cannot be requested */
+#define IRQ_NOAUTOEN		0x08000000	/* IRQ will not be enabled on request irq */
+#define IRQ_DELAYED_DISABLE	0x10000000	/* IRQ disable (masking) happens delayed. */
+
+struct proc_dir_entry;
+
+/**
+ * struct irq_chip - hardware interrupt chip descriptor
+ *
+ * @name:		name for /proc/interrupts
+ * @startup:		start up the interrupt (defaults to ->enable if NULL)
+ * @shutdown:		shut down the interrupt (defaults to ->disable if NULL)
+ * @enable:		enable the interrupt (defaults to chip->unmask if NULL)
+ * @disable:		disable the interrupt (defaults to chip->mask if NULL)
+ * @ack:		start of a new interrupt
+ * @mask:		mask an interrupt source
+ * @mask_ack:		ack and mask an interrupt source
+ * @unmask:		unmask an interrupt source
+ * @eoi:		end of interrupt - chip level
+ * @end:		end of interrupt - flow level
+ * @set_affinity:	set the CPU affinity on SMP machines
+ * @retrigger:		resend an IRQ to the CPU
+ * @set_type:		set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
+ * @set_wake:		enable/disable power-management wake-on of an IRQ
+ *
+ * @release:		release function solely used by UML
+ * @typename:		obsoleted by name, kept as migration helper
  */
-struct hw_interrupt_type {
-	const char * typename;
-	unsigned int (*startup)(unsigned int irq);
-	void (*shutdown)(unsigned int irq);
-	void (*enable)(unsigned int irq);
-	void (*disable)(unsigned int irq);
-	void (*ack)(unsigned int irq);
-	void (*end)(unsigned int irq);
-	void (*set_affinity)(unsigned int irq, cpumask_t dest);
+struct irq_chip {
+	const char	*name;
+	unsigned int	(*startup)(unsigned int irq);
+	void		(*shutdown)(unsigned int irq);
+	void		(*enable)(unsigned int irq);
+	void		(*disable)(unsigned int irq);
+
+	void		(*ack)(unsigned int irq);
+	void		(*mask)(unsigned int irq);
+	void		(*mask_ack)(unsigned int irq);
+	void		(*unmask)(unsigned int irq);
+	void		(*eoi)(unsigned int irq);
+
+	void		(*end)(unsigned int irq);
+	void		(*set_affinity)(unsigned int irq, cpumask_t dest);
+	int		(*retrigger)(unsigned int irq);
+	int		(*set_type)(unsigned int irq, unsigned int flow_type);
+	int		(*set_wake)(unsigned int irq, unsigned int on);
+
 	/* Currently used only by UML, might disappear one day.*/
 #ifdef CONFIG_IRQ_RELEASE_METHOD
-	void (*release)(unsigned int irq, void *dev_id);
+	void		(*release)(unsigned int irq, void *dev_id);
 #endif
+	/*
+	 * For compatibility, ->typename is copied into ->name.
+	 * Will disappear.
+	 */
+	const char	*typename;
 };
 
-typedef struct hw_interrupt_type  hw_irq_controller;
-
-/*
- * This is the "IRQ descriptor", which contains various information
- * about the irq, including what kind of hardware handling it has,
- * whether it is disabled etc etc.
+/**
+ * struct irq_desc - interrupt descriptor
+ *
+ * @handle_irq:		highlevel irq-events handler [if NULL, __do_IRQ()]
+ * @chip:		low level interrupt hardware access
+ * @handler_data:	per-IRQ data for the irq_chip methods
+ * @chip_data:		platform-specific per-chip private data for the chip
+ *			methods, to allow shared chip implementations
+ * @action:		the irq action chain
+ * @status:		status information
+ * @depth:		disable-depth, for nested irq_disable() calls
+ * @irq_count:		stats field to detect stalled irqs
+ * @irqs_unhandled:	stats field for spurious unhandled interrupts
+ * @lock:		locking for SMP
+ * @affinity:		IRQ affinity on SMP
+ * @cpu:		cpu index useful for balancing
+ * @pending_mask:	pending rebalanced interrupts
+ * @move_irq:		need to re-target IRQ destination
+ * @dir:		/proc/irq/ procfs entry
+ * @affinity_entry:	/proc/irq/smp_affinity procfs entry on SMP
  *
  * Pad this out to 32 bytes for cache and indexing reasons.
  */
-typedef struct irq_desc {
-	hw_irq_controller *handler;
-	void *handler_data;
-	struct irqaction *action;	/* IRQ action list */
-	unsigned int status;		/* IRQ status */
-	unsigned int depth;		/* nested irq disables */
-	unsigned int irq_count;		/* For detecting broken interrupts */
-	unsigned int irqs_unhandled;
-	spinlock_t lock;
-#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
-	unsigned int move_irq;		/* Flag need to re-target intr dest*/
+struct irq_desc {
+	void fastcall		(*handle_irq)(unsigned int irq,
+					      struct irq_desc *desc,
+					      struct pt_regs *regs);
+	struct irq_chip		*chip;
+	void			*handler_data;
+	void			*chip_data;
+	struct irqaction	*action;	/* IRQ action list */
+	unsigned int		status;		/* IRQ status */
+
+	unsigned int		depth;		/* nested irq disables */
+	unsigned int		irq_count;	/* For detecting broken IRQs */
+	unsigned int		irqs_unhandled;
+	spinlock_t		lock;
+#ifdef CONFIG_SMP
+	cpumask_t		affinity;
+	unsigned int		cpu;
+#endif
+#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
+	cpumask_t		pending_mask;
+	unsigned int		move_irq;	/* need to re-target IRQ dest */
+#endif
+#ifdef CONFIG_PROC_FS
+	struct proc_dir_entry *dir;
 #endif
-} ____cacheline_aligned irq_desc_t;
+} ____cacheline_aligned;
 
-extern irq_desc_t irq_desc [NR_IRQS];
+extern struct irq_desc irq_desc[NR_IRQS];
 
-/* Return a pointer to the irq descriptor for IRQ.  */
-static inline irq_desc_t *
-irq_descp (int irq)
-{
-	return irq_desc + irq;
-}
+/*
+ * Migration helpers for obsolete names, they will go away:
+ */
+#define hw_interrupt_type	irq_chip
+typedef struct irq_chip		hw_irq_controller;
+#define no_irq_type		no_irq_chip
+typedef struct irq_desc		irq_desc_t;
 
-#include <asm/hw_irq.h> /* the arch dependent stuff */
+/*
+ * Pick up the arch-dependent methods:
+ */
+#include <asm/hw_irq.h>
 
-extern int setup_irq(unsigned int irq, struct irqaction * new);
+extern int setup_irq(unsigned int irq, struct irqaction *new);
 
 #ifdef CONFIG_GENERIC_HARDIRQS
-extern cpumask_t irq_affinity[NR_IRQS];
+
+#ifndef handle_dynamic_tick
+# define handle_dynamic_tick(a)		do { } while (0)
+#endif
 
 #ifdef CONFIG_SMP
 static inline void set_native_irq_info(int irq, cpumask_t mask)
 {
-	irq_affinity[irq] = mask;
+	irq_desc[irq].affinity = mask;
 }
 #else
 static inline void set_native_irq_info(int irq, cpumask_t mask)
@@ -111,8 +199,7 @@ static inline void set_native_irq_info(int irq, cpumask_t mask)
 
 #ifdef CONFIG_SMP
 
-#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
-extern cpumask_t pending_irq_cpumask[NR_IRQS];
+#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 
 void set_pending_irq(unsigned int irq, cpumask_t mask);
 void move_native_irq(int irq);
@@ -133,7 +220,7 @@ static inline void set_irq_info(int irq, cpumask_t mask)
 {
 }
 
-#else // CONFIG_PCI_MSI
+#else /* CONFIG_PCI_MSI */
 
 static inline void move_irq(int irq)
 {
@@ -144,26 +231,36 @@ static inline void set_irq_info(int irq, cpumask_t mask)
 {
 	set_native_irq_info(irq, mask);
 }
-#endif // CONFIG_PCI_MSI
 
-#else	// CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE
+#endif /* CONFIG_PCI_MSI */
+
+#else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
+
+static inline void move_irq(int irq)
+{
+}
+
+static inline void move_native_irq(int irq)
+{
+}
+
+static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
+{
+}
 
-#define move_irq(x)
-#define move_native_irq(x)
-#define set_pending_irq(x,y)
 static inline void set_irq_info(int irq, cpumask_t mask)
 {
 	set_native_irq_info(irq, mask);
 }
 
-#endif // CONFIG_GENERIC_PENDING_IRQ
+#endif /* CONFIG_GENERIC_PENDING_IRQ */
 
-#else // CONFIG_SMP
+#else /* CONFIG_SMP */
 
 #define move_irq(x)
 #define move_native_irq(x)
 
-#endif // CONFIG_SMP
+#endif /* CONFIG_SMP */
 
 #ifdef CONFIG_IRQBALANCE
 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
@@ -173,32 +270,139 @@ static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
 }
 #endif
 
+#ifdef CONFIG_AUTO_IRQ_AFFINITY
+extern int select_smp_affinity(unsigned int irq);
+#else
+static inline int select_smp_affinity(unsigned int irq)
+{
+	return 1;
+}
+#endif
+
 extern int no_irq_affinity;
-extern int noirqdebug_setup(char *str);
 
-extern fastcall irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
-					struct irqaction *action);
+/* Handle irq action chains: */
+extern int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
+			    struct irqaction *action);
+
+/*
+ * Built-in IRQ handlers for various IRQ types,
+ * callable via desc->chip->handle_irq()
+ */
+extern void fastcall
+handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
+extern void fastcall
+handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc,
+			 struct pt_regs *regs);
+extern void fastcall
+handle_edge_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
+extern void fastcall
+handle_simple_irq(unsigned int irq, struct irq_desc *desc,
+		  struct pt_regs *regs);
+extern void fastcall
+handle_percpu_irq(unsigned int irq, struct irq_desc *desc,
+		  struct pt_regs *regs);
+extern void fastcall
+handle_bad_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
+
+/*
+ * Get a descriptive string for the highlevel handler, for
+ * /proc/interrupts output:
+ */
+extern const char *
+handle_irq_name(void fastcall (*handle)(unsigned int, struct irq_desc *,
+					struct pt_regs *));
+
+/*
+ * Monolithic do_IRQ implementation.
+ * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
+ */
 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
-extern void note_interrupt(unsigned int irq, irq_desc_t *desc,
-					int action_ret, struct pt_regs *regs);
-extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 
+/*
+ * Architectures call this to let the generic IRQ layer
+ * handle an interrupt. If the descriptor is attached to an
+ * irqchip-style controller then we call the ->handle_irq() handler,
+ * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
+ */
+static inline void generic_handle_irq(unsigned int irq, struct pt_regs *regs)
+{
+	struct irq_desc *desc = irq_desc + irq;
+
+	if (likely(desc->handle_irq))
+		desc->handle_irq(irq, desc, regs);
+	else
+		__do_IRQ(irq, regs);
+}
+
+/* Handling of unhandled and spurious interrupts: */
+extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
+			   int action_ret, struct pt_regs *regs);
+
+/* Resending of interrupts :*/
+void check_irq_resend(struct irq_desc *desc, unsigned int irq);
+
+/* Initialize /proc/irq/ */
 extern void init_irq_proc(void);
 
-#ifdef CONFIG_AUTO_IRQ_AFFINITY
-extern int select_smp_affinity(unsigned int irq);
-#else
-static inline int
-select_smp_affinity(unsigned int irq)
+/* Enable/disable irq debugging output: */
+extern int noirqdebug_setup(char *str);
+
+/* Checks whether the interrupt can be requested by request_irq(): */
+extern int can_request_irq(unsigned int irq, unsigned long irqflags);
+
+/* Dummy irq-chip implementations: */
+extern struct irq_chip no_irq_chip;
+extern struct irq_chip dummy_irq_chip;
+
+extern void
+set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
+			 void fastcall (*handle)(unsigned int,
+						 struct irq_desc *,
+						 struct pt_regs *));
+extern void
+__set_irq_handler(unsigned int irq,
+		  void fastcall (*handle)(unsigned int, struct irq_desc *,
+					  struct pt_regs *),
+		  int is_chained);
+
+/*
+ * Set a highlevel flow handler for a given IRQ:
+ */
+static inline void
+set_irq_handler(unsigned int irq,
+		void fastcall (*handle)(unsigned int, struct irq_desc *,
+					struct pt_regs *))
 {
-	return 1;
+	__set_irq_handler(irq, handle, 0);
 }
-#endif
 
-#endif
+/*
+ * Set a highlevel chained flow handler for a given IRQ.
+ * (a chained handler is automatically enabled and set to
+ *  IRQ_NOREQUEST and IRQ_NOPROBE)
+ */
+static inline void
+set_irq_chained_handler(unsigned int irq,
+			void fastcall (*handle)(unsigned int, struct irq_desc *,
+						struct pt_regs *))
+{
+	__set_irq_handler(irq, handle, 1);
+}
 
-extern hw_irq_controller no_irq_type;  /* needed in every arch ? */
+/* Set/get chip/data for an IRQ: */
 
-#endif
+extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
+extern int set_irq_data(unsigned int irq, void *data);
+extern int set_irq_chip_data(unsigned int irq, void *data);
+extern int set_irq_type(unsigned int irq, unsigned int type);
+
+#define get_irq_chip(irq)	(irq_desc[irq].chip)
+#define get_irq_chip_data(irq)	(irq_desc[irq].chip_data)
+#define get_irq_data(irq)	(irq_desc[irq].handler_data)
+
+#endif /* CONFIG_GENERIC_HARDIRQS */
+
+#endif /* !CONFIG_S390 */
 
-#endif /* __irq_h */
+#endif /* _LINUX_IRQ_H */