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Ingo Molnar06fcb0c2006-06-29 02:24:40 -07001#ifndef _LINUX_IRQ_H
2#define _LINUX_IRQ_H
Linus Torvalds1da177e2005-04-16 15:20:36 -07003
4/*
5 * Please do not include this file in generic code. There is currently
6 * no requirement for any architecture to implement anything held
7 * within this file.
8 *
9 * Thanks. --rmk
10 */
11
Adrian Bunk23f9b312005-12-21 02:27:50 +010012#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
Ingo Molnar06fcb0c2006-06-29 02:24:40 -070014#ifndef CONFIG_S390
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16#include <linux/linkage.h>
17#include <linux/cache.h>
18#include <linux/spinlock.h>
19#include <linux/cpumask.h>
Ralf Baechle503e5762009-03-29 12:59:50 +020020#include <linux/gfp.h>
Jan Beulich908dcec2006-06-23 02:06:00 -070021#include <linux/irqreturn.h>
Thomas Gleixnerdd3a1db2008-10-16 18:20:58 +020022#include <linux/irqnr.h>
David Howells77904fd2007-02-28 20:13:26 -080023#include <linux/errno.h>
Ralf Baechle503e5762009-03-29 12:59:50 +020024#include <linux/topology.h>
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010025#include <linux/wait.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27#include <asm/irq.h>
28#include <asm/ptrace.h>
David Howells7d12e782006-10-05 14:55:46 +010029#include <asm/irq_regs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
David Howells57a58a92006-10-05 13:06:34 +010031struct irq_desc;
Harvey Harrisonec701582008-02-08 04:19:55 -080032typedef void (*irq_flow_handler_t)(unsigned int irq,
David Howells7d12e782006-10-05 14:55:46 +010033 struct irq_desc *desc);
David Howells57a58a92006-10-05 13:06:34 +010034
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036/*
37 * IRQ line status.
Thomas Gleixner6e213612006-07-01 19:29:03 -070038 *
Thomas Gleixner950f4422007-02-16 01:27:24 -080039 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
Thomas Gleixner6e213612006-07-01 19:29:03 -070040 *
41 * IRQ types
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 */
Thomas Gleixner6e213612006-07-01 19:29:03 -070043#define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
44#define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
45#define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
46#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
47#define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
48#define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
49#define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
50#define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
51
52/* Internal flags */
Thomas Gleixner950f4422007-02-16 01:27:24 -080053#define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
54#define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
55#define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
56#define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
57#define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
58#define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
59#define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
60#define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
61#define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
62#define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
63#define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
64#define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
Ingo Molnard7e25f32007-02-16 01:28:24 -080065#define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
66#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
67#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
Thomas Gleixner1adb0852008-04-28 17:01:56 +020068#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +010069#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
70#define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +010071#define IRQ_SUSPENDED 0x04000000 /* IRQ has gone through suspend sequence */
Thomas Gleixner950f4422007-02-16 01:27:24 -080072
Ingo Molnar0d7012a2006-06-29 02:24:43 -070073#ifdef CONFIG_IRQ_PER_CPU
Karsten Wiesef26fdd52005-09-06 15:17:25 -070074# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
Thomas Gleixner950f4422007-02-16 01:27:24 -080075# define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
Karsten Wiesef26fdd52005-09-06 15:17:25 -070076#else
77# define CHECK_IRQ_PER_CPU(var) 0
Thomas Gleixner950f4422007-02-16 01:27:24 -080078# define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
Karsten Wiesef26fdd52005-09-06 15:17:25 -070079#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -070081struct proc_dir_entry;
Eric W. Biederman5b912c12007-01-28 12:52:03 -070082struct msi_desc;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -070083
Ingo Molnar8fee5c32006-06-29 02:24:45 -070084/**
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -070085 * struct irq_chip - hardware interrupt chip descriptor
Ingo Molnar8fee5c32006-06-29 02:24:45 -070086 *
87 * @name: name for /proc/interrupts
88 * @startup: start up the interrupt (defaults to ->enable if NULL)
89 * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
90 * @enable: enable the interrupt (defaults to chip->unmask if NULL)
91 * @disable: disable the interrupt (defaults to chip->mask if NULL)
Ingo Molnar8fee5c32006-06-29 02:24:45 -070092 * @ack: start of a new interrupt
93 * @mask: mask an interrupt source
94 * @mask_ack: ack and mask an interrupt source
95 * @unmask: unmask an interrupt source
Ingo Molnar47c2a3a2006-06-29 02:25:03 -070096 * @eoi: end of interrupt - chip level
97 * @end: end of interrupt - flow level
Ingo Molnar8fee5c32006-06-29 02:24:45 -070098 * @set_affinity: set the CPU affinity on SMP machines
99 * @retrigger: resend an IRQ to the CPU
100 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
101 * @set_wake: enable/disable power-management wake-on of an IRQ
102 *
103 * @release: release function solely used by UML
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700104 * @typename: obsoleted by name, kept as migration helper
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700106struct irq_chip {
107 const char *name;
Ingo Molnar71d218b2006-06-29 02:24:41 -0700108 unsigned int (*startup)(unsigned int irq);
109 void (*shutdown)(unsigned int irq);
110 void (*enable)(unsigned int irq);
111 void (*disable)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700112
Ingo Molnar71d218b2006-06-29 02:24:41 -0700113 void (*ack)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700114 void (*mask)(unsigned int irq);
115 void (*mask_ack)(unsigned int irq);
116 void (*unmask)(unsigned int irq);
Ingo Molnar47c2a3a2006-06-29 02:25:03 -0700117 void (*eoi)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700118
Ingo Molnar71d218b2006-06-29 02:24:41 -0700119 void (*end)(unsigned int irq);
Yinghai Lud5dedd42009-04-27 17:59:21 -0700120 int (*set_affinity)(unsigned int irq,
Rusty Russell0de26522008-12-13 21:20:26 +1030121 const struct cpumask *dest);
Ingo Molnarc0ad90a2006-06-29 02:24:44 -0700122 int (*retrigger)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700123 int (*set_type)(unsigned int irq, unsigned int flow_type);
124 int (*set_wake)(unsigned int irq, unsigned int on);
Ingo Molnarc0ad90a2006-06-29 02:24:44 -0700125
Paolo 'Blaisorblade' Giarrussob77d6ad2005-06-21 17:16:24 -0700126 /* Currently used only by UML, might disappear one day.*/
127#ifdef CONFIG_IRQ_RELEASE_METHOD
Ingo Molnar71d218b2006-06-29 02:24:41 -0700128 void (*release)(unsigned int irq, void *dev_id);
Paolo 'Blaisorblade' Giarrussob77d6ad2005-06-21 17:16:24 -0700129#endif
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700130 /*
131 * For compatibility, ->typename is copied into ->name.
132 * Will disappear.
133 */
134 const char *typename;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135};
136
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800137struct timer_rand_state;
138struct irq_2_iommu;
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700139/**
140 * struct irq_desc - interrupt descriptor
Randy Dunlap2ed1cdc2008-11-21 16:59:57 -0800141 * @irq: interrupt number for this descriptor
Yinghai Lu078a55d2008-12-18 16:57:52 -0800142 * @timer_rand_state: pointer to timer rand state struct
143 * @kstat_irqs: irq stats per cpu
144 * @irq_2_iommu: iommu with this irq
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700145 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
146 * @chip: low level interrupt hardware access
Randy Dunlap472900b2007-02-16 01:28:25 -0800147 * @msi_desc: MSI descriptor
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700148 * @handler_data: per-IRQ data for the irq_chip methods
149 * @chip_data: platform-specific per-chip private data for the chip
150 * methods, to allow shared chip implementations
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700151 * @action: the irq action chain
152 * @status: status information
153 * @depth: disable-depth, for nested irq_disable() calls
David Brownell15a647e2006-07-30 03:03:08 -0700154 * @wake_depth: enable depth, for multiple set_irq_wake() callers
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700155 * @irq_count: stats field to detect stalled irqs
Randy Dunlap5ac4d822007-07-31 00:39:03 -0700156 * @last_unhandled: aging timer for unhandled count
Richard Kennedye262a7b2008-11-23 14:34:43 +0000157 * @irqs_unhandled: stats field for spurious unhandled interrupts
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700158 * @lock: locking for SMP
159 * @affinity: IRQ affinity on SMP
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700160 * @cpu: cpu index useful for balancing
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700161 * @pending_mask: pending rebalanced interrupts
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100162 * @threads_active: number of irqaction threads currently running
163 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700164 * @dir: /proc/irq/ procfs entry
Ingo Molnara460e742006-10-17 00:10:03 -0700165 * @name: flow handler name for /proc/interrupts output
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 */
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700167struct irq_desc {
Yinghai Lu08678b02008-08-19 20:50:05 -0700168 unsigned int irq;
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800169 struct timer_rand_state *timer_rand_state;
170 unsigned int *kstat_irqs;
Yinghai Lud7e51e62009-01-07 15:03:13 -0800171#ifdef CONFIG_INTR_REMAP
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800172 struct irq_2_iommu *irq_2_iommu;
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800173#endif
David Howells57a58a92006-10-05 13:06:34 +0100174 irq_flow_handler_t handle_irq;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700175 struct irq_chip *chip;
Eric W. Biederman5b912c12007-01-28 12:52:03 -0700176 struct msi_desc *msi_desc;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700177 void *handler_data;
Ingo Molnar71d218b2006-06-29 02:24:41 -0700178 void *chip_data;
179 struct irqaction *action; /* IRQ action list */
180 unsigned int status; /* IRQ status */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700181
Ingo Molnar71d218b2006-06-29 02:24:41 -0700182 unsigned int depth; /* nested irq disables */
David Brownell15a647e2006-07-30 03:03:08 -0700183 unsigned int wake_depth; /* nested wake enables */
Ingo Molnar71d218b2006-06-29 02:24:41 -0700184 unsigned int irq_count; /* For detecting broken IRQs */
Alan Cox4f27c002007-07-15 23:40:55 -0700185 unsigned long last_unhandled; /* Aging timer for unhandled count */
Richard Kennedye262a7b2008-11-23 14:34:43 +0000186 unsigned int irqs_unhandled;
Ingo Molnar71d218b2006-06-29 02:24:41 -0700187 spinlock_t lock;
Ingo Molnara53da522006-06-29 02:24:38 -0700188#ifdef CONFIG_SMP
Mike Travis7f7ace02009-01-10 21:58:08 -0800189 cpumask_var_t affinity;
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700190 unsigned int node;
Yinghai Lu8b8e8c12008-08-19 20:50:23 -0700191#ifdef CONFIG_GENERIC_PENDING_IRQ
Mike Travis7f7ace02009-01-10 21:58:08 -0800192 cpumask_var_t pending_mask;
193#endif
Ashok Raj54d5d422005-09-06 15:16:15 -0700194#endif
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100195 atomic_t threads_active;
196 wait_queue_head_t wait_for_threads;
Ingo Molnar4a733ee2006-06-29 02:24:42 -0700197#ifdef CONFIG_PROC_FS
Ingo Molnara460e742006-10-17 00:10:03 -0700198 struct proc_dir_entry *dir;
Ingo Molnar4a733ee2006-06-29 02:24:42 -0700199#endif
Ingo Molnara460e742006-10-17 00:10:03 -0700200 const char *name;
Ravikiran G Thirumalaie729aa12007-05-08 00:29:13 -0700201} ____cacheline_internodealigned_in_smp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800203extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700204 struct irq_desc *desc, int node);
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800205extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
Yinghai Lu9059d8f2008-08-19 20:50:10 -0700206
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800207#ifndef CONFIG_SPARSE_IRQ
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700208extern struct irq_desc irq_desc[NR_IRQS];
Yinghai Lu15e957d2009-04-30 01:17:50 -0700209#endif
210
211#ifdef CONFIG_NUMA_IRQ_DESC
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700212extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
Yinghai Lu15e957d2009-04-30 01:17:50 -0700213#else
214static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
215{
216 return desc;
217}
218#endif
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800219
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700220extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
Thomas Gleixnerc6b76742008-10-15 14:31:29 +0200221
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700222/*
223 * Migration helpers for obsolete names, they will go away:
224 */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700225#define hw_interrupt_type irq_chip
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700226#define no_irq_type no_irq_chip
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700227typedef struct irq_desc irq_desc_t;
228
229/*
230 * Pick up the arch-dependent methods:
231 */
232#include <asm/hw_irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700234extern int setup_irq(unsigned int irq, struct irqaction *new);
Magnus Dammcbf94f02009-03-12 21:05:51 +0900235extern void remove_irq(unsigned int irq, struct irqaction *act);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237#ifdef CONFIG_GENERIC_HARDIRQS
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700238
Ashok Raj54d5d422005-09-06 15:16:15 -0700239#ifdef CONFIG_SMP
Ashok Raj54d5d422005-09-06 15:16:15 -0700240
Yinghai Lu8b8e8c12008-08-19 20:50:23 -0700241#ifdef CONFIG_GENERIC_PENDING_IRQ
Ashok Raj54d5d422005-09-06 15:16:15 -0700242
Andrew Mortonc777ac52006-03-25 03:07:36 -0800243void move_native_irq(int irq);
Eric W. Biedermane7b946e2006-10-04 02:16:29 -0700244void move_masked_irq(int irq);
Ashok Raj54d5d422005-09-06 15:16:15 -0700245
Yinghai Lu8b8e8c12008-08-19 20:50:23 -0700246#else /* CONFIG_GENERIC_PENDING_IRQ */
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700247
248static inline void move_irq(int irq)
249{
250}
251
252static inline void move_native_irq(int irq)
253{
254}
255
Eric W. Biedermane7b946e2006-10-04 02:16:29 -0700256static inline void move_masked_irq(int irq)
257{
258}
259
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700260#endif /* CONFIG_GENERIC_PENDING_IRQ */
Ashok Raj54d5d422005-09-06 15:16:15 -0700261
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700262#else /* CONFIG_SMP */
Ashok Raj54d5d422005-09-06 15:16:15 -0700263
Ashok Raj54d5d422005-09-06 15:16:15 -0700264#define move_native_irq(x)
Eric W. Biedermane7b946e2006-10-04 02:16:29 -0700265#define move_masked_irq(x)
Ashok Raj54d5d422005-09-06 15:16:15 -0700266
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700267#endif /* CONFIG_SMP */
Ashok Raj54d5d422005-09-06 15:16:15 -0700268
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269extern int no_irq_affinity;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
Thomas Gleixner950f4422007-02-16 01:27:24 -0800271static inline int irq_balancing_disabled(unsigned int irq)
272{
Yinghai Lu08678b02008-08-19 20:50:05 -0700273 struct irq_desc *desc;
274
275 desc = irq_to_desc(irq);
276 return desc->status & IRQ_NO_BALANCING_MASK;
Thomas Gleixner950f4422007-02-16 01:27:24 -0800277}
278
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700279/* Handle irq action chains: */
Thomas Gleixnerbedd30d2008-09-30 23:14:27 +0200280extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700281
Ingo Molnar2e60bbb2006-06-29 02:24:39 -0700282/*
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700283 * Built-in IRQ handlers for various IRQ types,
284 * callable via desc->chip->handle_irq()
285 */
Harvey Harrisonec701582008-02-08 04:19:55 -0800286extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
287extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
288extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
289extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
290extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
291extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700292
293/*
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700294 * Monolithic do_IRQ implementation.
Ingo Molnar2e60bbb2006-06-29 02:24:39 -0700295 */
David Howellsaf8c65b2006-09-25 23:32:07 -0700296#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
Harvey Harrisonec701582008-02-08 04:19:55 -0800297extern unsigned int __do_IRQ(unsigned int irq);
David Howellsaf8c65b2006-09-25 23:32:07 -0700298#endif
Ingo Molnar2e60bbb2006-06-29 02:24:39 -0700299
Ingo Molnardae86202006-06-29 02:24:52 -0700300/*
301 * Architectures call this to let the generic IRQ layer
302 * handle an interrupt. If the descriptor is attached to an
303 * irqchip-style controller then we call the ->handle_irq() handler,
304 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
305 */
Yinghai Lu46926b62008-08-19 20:50:15 -0700306static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
Ingo Molnardae86202006-06-29 02:24:52 -0700307{
David Howellsaf8c65b2006-09-25 23:32:07 -0700308#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
David Howells7d12e782006-10-05 14:55:46 +0100309 desc->handle_irq(irq, desc);
David Howellsaf8c65b2006-09-25 23:32:07 -0700310#else
Ingo Molnardae86202006-06-29 02:24:52 -0700311 if (likely(desc->handle_irq))
David Howells7d12e782006-10-05 14:55:46 +0100312 desc->handle_irq(irq, desc);
Ingo Molnardae86202006-06-29 02:24:52 -0700313 else
David Howells7d12e782006-10-05 14:55:46 +0100314 __do_IRQ(irq);
David Howellsaf8c65b2006-09-25 23:32:07 -0700315#endif
Ingo Molnardae86202006-06-29 02:24:52 -0700316}
317
Yinghai Lu46926b62008-08-19 20:50:15 -0700318static inline void generic_handle_irq(unsigned int irq)
319{
320 generic_handle_irq_desc(irq, irq_to_desc(irq));
321}
322
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700323/* Handling of unhandled and spurious interrupts: */
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700324extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
Thomas Gleixnerbedd30d2008-09-30 23:14:27 +0200325 irqreturn_t action_ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Thomas Gleixnera4633adc2006-06-29 02:24:48 -0700327/* Resending of interrupts :*/
328void check_irq_resend(struct irq_desc *desc, unsigned int irq);
329
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700330/* Enable/disable irq debugging output: */
331extern int noirqdebug_setup(char *str);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700333/* Checks whether the interrupt can be requested by request_irq(): */
334extern int can_request_irq(unsigned int irq, unsigned long irqflags);
335
Thomas Gleixnerf8b54732006-07-01 22:30:08 +0100336/* Dummy irq-chip implementations: */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700337extern struct irq_chip no_irq_chip;
Thomas Gleixnerf8b54732006-07-01 22:30:08 +0100338extern struct irq_chip dummy_irq_chip;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700339
340extern void
Ingo Molnar145fc652006-10-19 23:28:28 -0700341set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
342 irq_flow_handler_t handle);
343extern void
Ingo Molnara460e742006-10-17 00:10:03 -0700344set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
345 irq_flow_handler_t handle, const char *name);
346
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700347extern void
Ingo Molnara460e742006-10-17 00:10:03 -0700348__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
349 const char *name);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700350
Kevin Hilmanb019e572007-12-18 18:05:58 +0100351/* caller has locked the irq_desc and both params are valid */
352static inline void __set_irq_handler_unlocked(int irq,
353 irq_flow_handler_t handler)
354{
Yinghai Lu08678b02008-08-19 20:50:05 -0700355 struct irq_desc *desc;
356
357 desc = irq_to_desc(irq);
358 desc->handle_irq = handler;
Kevin Hilmanb019e572007-12-18 18:05:58 +0100359}
360
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700361/*
362 * Set a highlevel flow handler for a given IRQ:
363 */
364static inline void
David Howells57a58a92006-10-05 13:06:34 +0100365set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700366{
Ingo Molnara460e742006-10-17 00:10:03 -0700367 __set_irq_handler(irq, handle, 0, NULL);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700368}
369
370/*
371 * Set a highlevel chained flow handler for a given IRQ.
372 * (a chained handler is automatically enabled and set to
373 * IRQ_NOREQUEST and IRQ_NOPROBE)
374 */
375static inline void
376set_irq_chained_handler(unsigned int irq,
David Howells57a58a92006-10-05 13:06:34 +0100377 irq_flow_handler_t handle)
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700378{
Ingo Molnara460e742006-10-17 00:10:03 -0700379 __set_irq_handler(irq, handle, 1, NULL);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700380}
381
Ralf Baechle46f4f8f2008-02-08 04:22:01 -0800382extern void set_irq_noprobe(unsigned int irq);
383extern void set_irq_probe(unsigned int irq);
384
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700385/* Handle dynamic irq creation and destruction */
Yinghai Lud047f53a2009-04-27 18:02:23 -0700386extern unsigned int create_irq_nr(unsigned int irq_want, int node);
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700387extern int create_irq(void);
388extern void destroy_irq(unsigned int irq);
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700389
Eric W. Biederman1f800252006-10-04 02:16:56 -0700390/* Test to see if a driver has successfully requested an irq */
391static inline int irq_has_action(unsigned int irq)
392{
Yinghai Lu08678b02008-08-19 20:50:05 -0700393 struct irq_desc *desc = irq_to_desc(irq);
Eric W. Biederman1f800252006-10-04 02:16:56 -0700394 return desc->action != NULL;
395}
396
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700397/* Dynamic irq helper functions */
398extern void dynamic_irq_init(unsigned int irq);
399extern void dynamic_irq_cleanup(unsigned int irq);
400
401/* Set/get chip/data for an IRQ: */
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700402extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
403extern int set_irq_data(unsigned int irq, void *data);
404extern int set_irq_chip_data(unsigned int irq, void *data);
405extern int set_irq_type(unsigned int irq, unsigned int type);
Eric W. Biederman5b912c12007-01-28 12:52:03 -0700406extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700407
Yinghai Lu08678b02008-08-19 20:50:05 -0700408#define get_irq_chip(irq) (irq_to_desc(irq)->chip)
409#define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
410#define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
411#define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700412
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800413#define get_irq_desc_chip(desc) ((desc)->chip)
414#define get_irq_desc_chip_data(desc) ((desc)->chip_data)
415#define get_irq_desc_data(desc) ((desc)->handler_data)
416#define get_irq_desc_msi(desc) ((desc)->msi_desc)
417
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700418#endif /* CONFIG_GENERIC_HARDIRQS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700420#endif /* !CONFIG_S390 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Mike Travis7f7ace02009-01-10 21:58:08 -0800422#ifdef CONFIG_SMP
423/**
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700424 * alloc_desc_masks - allocate cpumasks for irq_desc
Mike Travis7f7ace02009-01-10 21:58:08 -0800425 * @desc: pointer to irq_desc struct
Mike Travis802bf932009-01-10 21:58:09 -0800426 * @cpu: cpu which will be handling the cpumasks
Mike Travis7f7ace02009-01-10 21:58:08 -0800427 * @boot: true if need bootmem
428 *
429 * Allocates affinity and pending_mask cpumask if required.
430 * Returns true if successful (or not required).
Mike Travis7f7ace02009-01-10 21:58:08 -0800431 */
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700432static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
Yinghai Lu38c7fed2009-05-25 15:10:58 +0300433 bool boot)
Mike Travis7f7ace02009-01-10 21:58:08 -0800434{
Yinghai Lu38c7fed2009-05-25 15:10:58 +0300435 gfp_t gfp = GFP_ATOMIC;
436
437 if (boot)
438 gfp = GFP_NOWAIT;
439
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700440#ifdef CONFIG_CPUMASK_OFFSTACK
Yinghai Lu38c7fed2009-05-25 15:10:58 +0300441 if (!alloc_cpumask_var_node(&desc->affinity, gfp, node))
Mike Travis7f7ace02009-01-10 21:58:08 -0800442 return false;
Mike Travis7f7ace02009-01-10 21:58:08 -0800443
444#ifdef CONFIG_GENERIC_PENDING_IRQ
Yinghai Lu38c7fed2009-05-25 15:10:58 +0300445 if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
Mike Travis7f7ace02009-01-10 21:58:08 -0800446 free_cpumask_var(desc->affinity);
447 return false;
448 }
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700449#endif
Mike Travis7f7ace02009-01-10 21:58:08 -0800450#endif
451 return true;
452}
453
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700454static inline void init_desc_masks(struct irq_desc *desc)
455{
456 cpumask_setall(desc->affinity);
457#ifdef CONFIG_GENERIC_PENDING_IRQ
458 cpumask_clear(desc->pending_mask);
459#endif
460}
461
Mike Travis7f7ace02009-01-10 21:58:08 -0800462/**
463 * init_copy_desc_masks - copy cpumasks for irq_desc
464 * @old_desc: pointer to old irq_desc struct
465 * @new_desc: pointer to new irq_desc struct
466 *
467 * Insures affinity and pending_masks are copied to new irq_desc.
468 * If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
469 * irq_desc struct so the copy is redundant.
470 */
471
472static inline void init_copy_desc_masks(struct irq_desc *old_desc,
473 struct irq_desc *new_desc)
474{
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700475#ifdef CONFIG_CPUMASK_OFFSTACK
Mike Travis7f7ace02009-01-10 21:58:08 -0800476 cpumask_copy(new_desc->affinity, old_desc->affinity);
477
478#ifdef CONFIG_GENERIC_PENDING_IRQ
479 cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
480#endif
481#endif
482}
483
Yinghai Lu9756b152009-03-30 20:37:20 -0700484static inline void free_desc_masks(struct irq_desc *old_desc,
485 struct irq_desc *new_desc)
486{
487 free_cpumask_var(old_desc->affinity);
488
489#ifdef CONFIG_GENERIC_PENDING_IRQ
490 free_cpumask_var(old_desc->pending_mask);
491#endif
492}
493
Mike Travis7f7ace02009-01-10 21:58:08 -0800494#else /* !CONFIG_SMP */
495
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700496static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
Mike Travis7f7ace02009-01-10 21:58:08 -0800497 bool boot)
498{
499 return true;
500}
501
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700502static inline void init_desc_masks(struct irq_desc *desc)
503{
504}
505
Mike Travis7f7ace02009-01-10 21:58:08 -0800506static inline void init_copy_desc_masks(struct irq_desc *old_desc,
507 struct irq_desc *new_desc)
508{
509}
510
Yinghai Lu9756b152009-03-30 20:37:20 -0700511static inline void free_desc_masks(struct irq_desc *old_desc,
512 struct irq_desc *new_desc)
513{
514}
Mike Travis7f7ace02009-01-10 21:58:08 -0800515#endif /* CONFIG_SMP */
516
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700517#endif /* _LINUX_IRQ_H */