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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 Gleixnerb25c3402009-08-13 12:17:22 +020072#define IRQ_ONESHOT 0x08000000 /* IRQ is not unmasked after hardirq */
Thomas Gleixner399b5da2009-08-13 13:21:38 +020073#define IRQ_NESTED_THREAD 0x10000000 /* IRQ is nested into another, no own handler thread */
Thomas Gleixner950f4422007-02-16 01:27:24 -080074
Ingo Molnar0d7012a2006-06-29 02:24:43 -070075#ifdef CONFIG_IRQ_PER_CPU
Karsten Wiesef26fdd52005-09-06 15:17:25 -070076# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
Thomas Gleixner950f4422007-02-16 01:27:24 -080077# define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
Karsten Wiesef26fdd52005-09-06 15:17:25 -070078#else
79# define CHECK_IRQ_PER_CPU(var) 0
Thomas Gleixner950f4422007-02-16 01:27:24 -080080# define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
Karsten Wiesef26fdd52005-09-06 15:17:25 -070081#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -070083struct proc_dir_entry;
Eric W. Biederman5b912c12007-01-28 12:52:03 -070084struct msi_desc;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -070085
Ingo Molnar8fee5c32006-06-29 02:24:45 -070086/**
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -070087 * struct irq_chip - hardware interrupt chip descriptor
Ingo Molnar8fee5c32006-06-29 02:24:45 -070088 *
89 * @name: name for /proc/interrupts
90 * @startup: start up the interrupt (defaults to ->enable if NULL)
91 * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
92 * @enable: enable the interrupt (defaults to chip->unmask if NULL)
Mark Brown599faa02010-01-05 13:29:58 +000093 * @disable: disable the interrupt
Ingo Molnar8fee5c32006-06-29 02:24:45 -070094 * @ack: start of a new interrupt
95 * @mask: mask an interrupt source
96 * @mask_ack: ack and mask an interrupt source
97 * @unmask: unmask an interrupt source
Ingo Molnar47c2a3a2006-06-29 02:25:03 -070098 * @eoi: end of interrupt - chip level
99 * @end: end of interrupt - flow level
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700100 * @set_affinity: set the CPU affinity on SMP machines
101 * @retrigger: resend an IRQ to the CPU
102 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
103 * @set_wake: enable/disable power-management wake-on of an IRQ
104 *
Thomas Gleixner70aedd22009-08-13 12:17:48 +0200105 * @bus_lock: function to lock access to slow bus (i2c) chips
106 * @bus_sync_unlock: function to sync and unlock slow bus (i2c) chips
107 *
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700108 * @release: release function solely used by UML
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700109 * @typename: obsoleted by name, kept as migration helper
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700111struct irq_chip {
112 const char *name;
Ingo Molnar71d218b2006-06-29 02:24:41 -0700113 unsigned int (*startup)(unsigned int irq);
114 void (*shutdown)(unsigned int irq);
115 void (*enable)(unsigned int irq);
116 void (*disable)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700117
Ingo Molnar71d218b2006-06-29 02:24:41 -0700118 void (*ack)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700119 void (*mask)(unsigned int irq);
120 void (*mask_ack)(unsigned int irq);
121 void (*unmask)(unsigned int irq);
Ingo Molnar47c2a3a2006-06-29 02:25:03 -0700122 void (*eoi)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700123
Ingo Molnar71d218b2006-06-29 02:24:41 -0700124 void (*end)(unsigned int irq);
Yinghai Lud5dedd42009-04-27 17:59:21 -0700125 int (*set_affinity)(unsigned int irq,
Rusty Russell0de26522008-12-13 21:20:26 +1030126 const struct cpumask *dest);
Ingo Molnarc0ad90a2006-06-29 02:24:44 -0700127 int (*retrigger)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700128 int (*set_type)(unsigned int irq, unsigned int flow_type);
129 int (*set_wake)(unsigned int irq, unsigned int on);
Ingo Molnarc0ad90a2006-06-29 02:24:44 -0700130
Thomas Gleixner70aedd22009-08-13 12:17:48 +0200131 void (*bus_lock)(unsigned int irq);
132 void (*bus_sync_unlock)(unsigned int irq);
133
Paolo 'Blaisorblade' Giarrussob77d6ad2005-06-21 17:16:24 -0700134 /* Currently used only by UML, might disappear one day.*/
135#ifdef CONFIG_IRQ_RELEASE_METHOD
Ingo Molnar71d218b2006-06-29 02:24:41 -0700136 void (*release)(unsigned int irq, void *dev_id);
Paolo 'Blaisorblade' Giarrussob77d6ad2005-06-21 17:16:24 -0700137#endif
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700138 /*
139 * For compatibility, ->typename is copied into ->name.
140 * Will disappear.
141 */
142 const char *typename;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143};
144
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800145struct timer_rand_state;
146struct irq_2_iommu;
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700147/**
148 * struct irq_desc - interrupt descriptor
Randy Dunlap2ed1cdc2008-11-21 16:59:57 -0800149 * @irq: interrupt number for this descriptor
Yinghai Lu078a55d2008-12-18 16:57:52 -0800150 * @timer_rand_state: pointer to timer rand state struct
151 * @kstat_irqs: irq stats per cpu
152 * @irq_2_iommu: iommu with this irq
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700153 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
154 * @chip: low level interrupt hardware access
Randy Dunlap472900b2007-02-16 01:28:25 -0800155 * @msi_desc: MSI descriptor
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700156 * @handler_data: per-IRQ data for the irq_chip methods
157 * @chip_data: platform-specific per-chip private data for the chip
158 * methods, to allow shared chip implementations
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700159 * @action: the irq action chain
160 * @status: status information
161 * @depth: disable-depth, for nested irq_disable() calls
David Brownell15a647e2006-07-30 03:03:08 -0700162 * @wake_depth: enable depth, for multiple set_irq_wake() callers
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700163 * @irq_count: stats field to detect stalled irqs
Randy Dunlap5ac4d822007-07-31 00:39:03 -0700164 * @last_unhandled: aging timer for unhandled count
Richard Kennedye262a7b2008-11-23 14:34:43 +0000165 * @irqs_unhandled: stats field for spurious unhandled interrupts
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700166 * @lock: locking for SMP
167 * @affinity: IRQ affinity on SMP
Randy Dunlapab33dcf2009-06-13 20:01:00 -0700168 * @node: node index useful for balancing
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700169 * @pending_mask: pending rebalanced interrupts
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100170 * @threads_active: number of irqaction threads currently running
171 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700172 * @dir: /proc/irq/ procfs entry
Ingo Molnara460e742006-10-17 00:10:03 -0700173 * @name: flow handler name for /proc/interrupts output
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 */
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700175struct irq_desc {
Yinghai Lu08678b02008-08-19 20:50:05 -0700176 unsigned int irq;
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800177 struct timer_rand_state *timer_rand_state;
178 unsigned int *kstat_irqs;
Yinghai Lud7e51e62009-01-07 15:03:13 -0800179#ifdef CONFIG_INTR_REMAP
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800180 struct irq_2_iommu *irq_2_iommu;
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800181#endif
David Howells57a58a92006-10-05 13:06:34 +0100182 irq_flow_handler_t handle_irq;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700183 struct irq_chip *chip;
Eric W. Biederman5b912c12007-01-28 12:52:03 -0700184 struct msi_desc *msi_desc;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700185 void *handler_data;
Ingo Molnar71d218b2006-06-29 02:24:41 -0700186 void *chip_data;
187 struct irqaction *action; /* IRQ action list */
188 unsigned int status; /* IRQ status */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700189
Ingo Molnar71d218b2006-06-29 02:24:41 -0700190 unsigned int depth; /* nested irq disables */
David Brownell15a647e2006-07-30 03:03:08 -0700191 unsigned int wake_depth; /* nested wake enables */
Ingo Molnar71d218b2006-06-29 02:24:41 -0700192 unsigned int irq_count; /* For detecting broken IRQs */
Alan Cox4f27c002007-07-15 23:40:55 -0700193 unsigned long last_unhandled; /* Aging timer for unhandled count */
Richard Kennedye262a7b2008-11-23 14:34:43 +0000194 unsigned int irqs_unhandled;
Thomas Gleixner239007b2009-11-17 16:46:45 +0100195 raw_spinlock_t lock;
Ingo Molnara53da522006-06-29 02:24:38 -0700196#ifdef CONFIG_SMP
Mike Travis7f7ace02009-01-10 21:58:08 -0800197 cpumask_var_t affinity;
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700198 unsigned int node;
Yinghai Lu8b8e8c12008-08-19 20:50:23 -0700199#ifdef CONFIG_GENERIC_PENDING_IRQ
Mike Travis7f7ace02009-01-10 21:58:08 -0800200 cpumask_var_t pending_mask;
201#endif
Ashok Raj54d5d422005-09-06 15:16:15 -0700202#endif
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100203 atomic_t threads_active;
204 wait_queue_head_t wait_for_threads;
Ingo Molnar4a733ee2006-06-29 02:24:42 -0700205#ifdef CONFIG_PROC_FS
Ingo Molnara460e742006-10-17 00:10:03 -0700206 struct proc_dir_entry *dir;
Ingo Molnar4a733ee2006-06-29 02:24:42 -0700207#endif
Ingo Molnara460e742006-10-17 00:10:03 -0700208 const char *name;
Ravikiran G Thirumalaie729aa12007-05-08 00:29:13 -0700209} ____cacheline_internodealigned_in_smp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800211extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700212 struct irq_desc *desc, int node);
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800213extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
Yinghai Lu9059d8f2008-08-19 20:50:10 -0700214
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800215#ifndef CONFIG_SPARSE_IRQ
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700216extern struct irq_desc irq_desc[NR_IRQS];
Yinghai Lu15e957d2009-04-30 01:17:50 -0700217#endif
218
219#ifdef CONFIG_NUMA_IRQ_DESC
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700220extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
Yinghai Lu15e957d2009-04-30 01:17:50 -0700221#else
222static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
223{
224 return desc;
225}
226#endif
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800227
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700228extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
Thomas Gleixnerc6b76742008-10-15 14:31:29 +0200229
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700230/*
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700231 * Pick up the arch-dependent methods:
232 */
233#include <asm/hw_irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700235extern int setup_irq(unsigned int irq, struct irqaction *new);
Magnus Dammcbf94f02009-03-12 21:05:51 +0900236extern void remove_irq(unsigned int irq, struct irqaction *act);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238#ifdef CONFIG_GENERIC_HARDIRQS
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700239
Ashok Raj54d5d422005-09-06 15:16:15 -0700240#ifdef CONFIG_SMP
Ashok Raj54d5d422005-09-06 15:16:15 -0700241
Yinghai Lu8b8e8c12008-08-19 20:50:23 -0700242#ifdef CONFIG_GENERIC_PENDING_IRQ
Ashok Raj54d5d422005-09-06 15:16:15 -0700243
Andrew Mortonc777ac52006-03-25 03:07:36 -0800244void move_native_irq(int irq);
Eric W. Biedermane7b946e2006-10-04 02:16:29 -0700245void move_masked_irq(int irq);
Ashok Raj54d5d422005-09-06 15:16:15 -0700246
Yinghai Lu8b8e8c12008-08-19 20:50:23 -0700247#else /* CONFIG_GENERIC_PENDING_IRQ */
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700248
249static inline void move_irq(int irq)
250{
251}
252
253static inline void move_native_irq(int irq)
254{
255}
256
Eric W. Biedermane7b946e2006-10-04 02:16:29 -0700257static inline void move_masked_irq(int irq)
258{
259}
260
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700261#endif /* CONFIG_GENERIC_PENDING_IRQ */
Ashok Raj54d5d422005-09-06 15:16:15 -0700262
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700263#else /* CONFIG_SMP */
Ashok Raj54d5d422005-09-06 15:16:15 -0700264
Ashok Raj54d5d422005-09-06 15:16:15 -0700265#define move_native_irq(x)
Eric W. Biedermane7b946e2006-10-04 02:16:29 -0700266#define move_masked_irq(x)
Ashok Raj54d5d422005-09-06 15:16:15 -0700267
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700268#endif /* CONFIG_SMP */
Ashok Raj54d5d422005-09-06 15:16:15 -0700269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270extern int no_irq_affinity;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Thomas Gleixner950f4422007-02-16 01:27:24 -0800272static inline int irq_balancing_disabled(unsigned int irq)
273{
Yinghai Lu08678b02008-08-19 20:50:05 -0700274 struct irq_desc *desc;
275
276 desc = irq_to_desc(irq);
277 return desc->status & IRQ_NO_BALANCING_MASK;
Thomas Gleixner950f4422007-02-16 01:27:24 -0800278}
279
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700280/* Handle irq action chains: */
Thomas Gleixnerbedd30d2008-09-30 23:14:27 +0200281extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700282
Ingo Molnar2e60bbb2006-06-29 02:24:39 -0700283/*
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700284 * Built-in IRQ handlers for various IRQ types,
Krzysztof Halasabebd04c2009-11-15 18:57:24 +0100285 * callable via desc->handle_irq()
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700286 */
Harvey Harrisonec701582008-02-08 04:19:55 -0800287extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
288extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
289extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
290extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
291extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
292extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
Mark Brown31b47cf2009-08-24 20:28:04 +0100293extern void handle_nested_irq(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700294
295/*
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700296 * Monolithic do_IRQ implementation.
Ingo Molnar2e60bbb2006-06-29 02:24:39 -0700297 */
David Howellsaf8c65b2006-09-25 23:32:07 -0700298#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
Harvey Harrisonec701582008-02-08 04:19:55 -0800299extern unsigned int __do_IRQ(unsigned int irq);
David Howellsaf8c65b2006-09-25 23:32:07 -0700300#endif
Ingo Molnar2e60bbb2006-06-29 02:24:39 -0700301
Ingo Molnardae86202006-06-29 02:24:52 -0700302/*
303 * Architectures call this to let the generic IRQ layer
304 * handle an interrupt. If the descriptor is attached to an
305 * irqchip-style controller then we call the ->handle_irq() handler,
306 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
307 */
Yinghai Lu46926b62008-08-19 20:50:15 -0700308static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
Ingo Molnardae86202006-06-29 02:24:52 -0700309{
David Howellsaf8c65b2006-09-25 23:32:07 -0700310#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
David Howells7d12e782006-10-05 14:55:46 +0100311 desc->handle_irq(irq, desc);
David Howellsaf8c65b2006-09-25 23:32:07 -0700312#else
Ingo Molnardae86202006-06-29 02:24:52 -0700313 if (likely(desc->handle_irq))
David Howells7d12e782006-10-05 14:55:46 +0100314 desc->handle_irq(irq, desc);
Ingo Molnardae86202006-06-29 02:24:52 -0700315 else
David Howells7d12e782006-10-05 14:55:46 +0100316 __do_IRQ(irq);
David Howellsaf8c65b2006-09-25 23:32:07 -0700317#endif
Ingo Molnardae86202006-06-29 02:24:52 -0700318}
319
Yinghai Lu46926b62008-08-19 20:50:15 -0700320static inline void generic_handle_irq(unsigned int irq)
321{
322 generic_handle_irq_desc(irq, irq_to_desc(irq));
323}
324
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700325/* Handling of unhandled and spurious interrupts: */
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700326extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
Thomas Gleixnerbedd30d2008-09-30 23:14:27 +0200327 irqreturn_t action_ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Thomas Gleixnera4633adc2006-06-29 02:24:48 -0700329/* Resending of interrupts :*/
330void check_irq_resend(struct irq_desc *desc, unsigned int irq);
331
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700332/* Enable/disable irq debugging output: */
333extern int noirqdebug_setup(char *str);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700335/* Checks whether the interrupt can be requested by request_irq(): */
336extern int can_request_irq(unsigned int irq, unsigned long irqflags);
337
Thomas Gleixnerf8b54732006-07-01 22:30:08 +0100338/* Dummy irq-chip implementations: */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700339extern struct irq_chip no_irq_chip;
Thomas Gleixnerf8b54732006-07-01 22:30:08 +0100340extern struct irq_chip dummy_irq_chip;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700341
342extern void
Ingo Molnar145fc652006-10-19 23:28:28 -0700343set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
344 irq_flow_handler_t handle);
345extern void
Ingo Molnara460e742006-10-17 00:10:03 -0700346set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
347 irq_flow_handler_t handle, const char *name);
348
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700349extern void
Ingo Molnara460e742006-10-17 00:10:03 -0700350__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
351 const char *name);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700352
Kevin Hilmanb019e572007-12-18 18:05:58 +0100353/* caller has locked the irq_desc and both params are valid */
354static inline void __set_irq_handler_unlocked(int irq,
355 irq_flow_handler_t handler)
356{
Yinghai Lu08678b02008-08-19 20:50:05 -0700357 struct irq_desc *desc;
358
359 desc = irq_to_desc(irq);
360 desc->handle_irq = handler;
Kevin Hilmanb019e572007-12-18 18:05:58 +0100361}
362
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700363/*
364 * Set a highlevel flow handler for a given IRQ:
365 */
366static inline void
David Howells57a58a92006-10-05 13:06:34 +0100367set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700368{
Ingo Molnara460e742006-10-17 00:10:03 -0700369 __set_irq_handler(irq, handle, 0, NULL);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700370}
371
372/*
373 * Set a highlevel chained flow handler for a given IRQ.
374 * (a chained handler is automatically enabled and set to
375 * IRQ_NOREQUEST and IRQ_NOPROBE)
376 */
377static inline void
378set_irq_chained_handler(unsigned int irq,
David Howells57a58a92006-10-05 13:06:34 +0100379 irq_flow_handler_t handle)
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700380{
Ingo Molnara460e742006-10-17 00:10:03 -0700381 __set_irq_handler(irq, handle, 1, NULL);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700382}
383
Thomas Gleixner399b5da2009-08-13 13:21:38 +0200384extern void set_irq_nested_thread(unsigned int irq, int nest);
385
Ralf Baechle46f4f8f2008-02-08 04:22:01 -0800386extern void set_irq_noprobe(unsigned int irq);
387extern void set_irq_probe(unsigned int irq);
388
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700389/* Handle dynamic irq creation and destruction */
Yinghai Lud047f53a2009-04-27 18:02:23 -0700390extern unsigned int create_irq_nr(unsigned int irq_want, int node);
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700391extern int create_irq(void);
392extern void destroy_irq(unsigned int irq);
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700393
Eric W. Biederman1f800252006-10-04 02:16:56 -0700394/* Test to see if a driver has successfully requested an irq */
395static inline int irq_has_action(unsigned int irq)
396{
Yinghai Lu08678b02008-08-19 20:50:05 -0700397 struct irq_desc *desc = irq_to_desc(irq);
Eric W. Biederman1f800252006-10-04 02:16:56 -0700398 return desc->action != NULL;
399}
400
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700401/* Dynamic irq helper functions */
402extern void dynamic_irq_init(unsigned int irq);
Brandon Phiilpsced5b692010-02-10 01:20:06 -0800403void dynamic_irq_init_keep_chip_data(unsigned int irq);
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700404extern void dynamic_irq_cleanup(unsigned int irq);
Brandon Phiilpsced5b692010-02-10 01:20:06 -0800405void dynamic_irq_cleanup_keep_chip_data(unsigned int irq);
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700406
407/* Set/get chip/data for an IRQ: */
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700408extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
409extern int set_irq_data(unsigned int irq, void *data);
410extern int set_irq_chip_data(unsigned int irq, void *data);
411extern int set_irq_type(unsigned int irq, unsigned int type);
Eric W. Biederman5b912c12007-01-28 12:52:03 -0700412extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700413
Yinghai Lu08678b02008-08-19 20:50:05 -0700414#define get_irq_chip(irq) (irq_to_desc(irq)->chip)
415#define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
416#define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
417#define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700418
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800419#define get_irq_desc_chip(desc) ((desc)->chip)
420#define get_irq_desc_chip_data(desc) ((desc)->chip_data)
421#define get_irq_desc_data(desc) ((desc)->handler_data)
422#define get_irq_desc_msi(desc) ((desc)->msi_desc)
423
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700424#endif /* CONFIG_GENERIC_HARDIRQS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700426#endif /* !CONFIG_S390 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Mike Travis7f7ace02009-01-10 21:58:08 -0800428#ifdef CONFIG_SMP
429/**
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700430 * alloc_desc_masks - allocate cpumasks for irq_desc
Mike Travis7f7ace02009-01-10 21:58:08 -0800431 * @desc: pointer to irq_desc struct
Randy Dunlapab33dcf2009-06-13 20:01:00 -0700432 * @node: node which will be handling the cpumasks
Mike Travis7f7ace02009-01-10 21:58:08 -0800433 * @boot: true if need bootmem
434 *
435 * Allocates affinity and pending_mask cpumask if required.
436 * Returns true if successful (or not required).
Mike Travis7f7ace02009-01-10 21:58:08 -0800437 */
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700438static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
Yinghai Lu38c7fed2009-05-25 15:10:58 +0300439 bool boot)
Mike Travis7f7ace02009-01-10 21:58:08 -0800440{
Yinghai Lu38c7fed2009-05-25 15:10:58 +0300441 gfp_t gfp = GFP_ATOMIC;
442
443 if (boot)
444 gfp = GFP_NOWAIT;
445
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700446#ifdef CONFIG_CPUMASK_OFFSTACK
Yinghai Lu38c7fed2009-05-25 15:10:58 +0300447 if (!alloc_cpumask_var_node(&desc->affinity, gfp, node))
Mike Travis7f7ace02009-01-10 21:58:08 -0800448 return false;
Mike Travis7f7ace02009-01-10 21:58:08 -0800449
450#ifdef CONFIG_GENERIC_PENDING_IRQ
Yinghai Lu38c7fed2009-05-25 15:10:58 +0300451 if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
Mike Travis7f7ace02009-01-10 21:58:08 -0800452 free_cpumask_var(desc->affinity);
453 return false;
454 }
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700455#endif
Mike Travis7f7ace02009-01-10 21:58:08 -0800456#endif
457 return true;
458}
459
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700460static inline void init_desc_masks(struct irq_desc *desc)
461{
462 cpumask_setall(desc->affinity);
463#ifdef CONFIG_GENERIC_PENDING_IRQ
464 cpumask_clear(desc->pending_mask);
465#endif
466}
467
Mike Travis7f7ace02009-01-10 21:58:08 -0800468/**
469 * init_copy_desc_masks - copy cpumasks for irq_desc
470 * @old_desc: pointer to old irq_desc struct
471 * @new_desc: pointer to new irq_desc struct
472 *
473 * Insures affinity and pending_masks are copied to new irq_desc.
474 * If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
475 * irq_desc struct so the copy is redundant.
476 */
477
478static inline void init_copy_desc_masks(struct irq_desc *old_desc,
479 struct irq_desc *new_desc)
480{
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700481#ifdef CONFIG_CPUMASK_OFFSTACK
Mike Travis7f7ace02009-01-10 21:58:08 -0800482 cpumask_copy(new_desc->affinity, old_desc->affinity);
483
484#ifdef CONFIG_GENERIC_PENDING_IRQ
485 cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
486#endif
487#endif
488}
489
Yinghai Lu9756b152009-03-30 20:37:20 -0700490static inline void free_desc_masks(struct irq_desc *old_desc,
491 struct irq_desc *new_desc)
492{
493 free_cpumask_var(old_desc->affinity);
494
495#ifdef CONFIG_GENERIC_PENDING_IRQ
496 free_cpumask_var(old_desc->pending_mask);
497#endif
498}
499
Mike Travis7f7ace02009-01-10 21:58:08 -0800500#else /* !CONFIG_SMP */
501
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700502static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
Mike Travis7f7ace02009-01-10 21:58:08 -0800503 bool boot)
504{
505 return true;
506}
507
Yinghai Lu9ec4fa22009-04-27 17:57:18 -0700508static inline void init_desc_masks(struct irq_desc *desc)
509{
510}
511
Mike Travis7f7ace02009-01-10 21:58:08 -0800512static inline void init_copy_desc_masks(struct irq_desc *old_desc,
513 struct irq_desc *new_desc)
514{
515}
516
Yinghai Lu9756b152009-03-30 20:37:20 -0700517static inline void free_desc_masks(struct irq_desc *old_desc,
518 struct irq_desc *new_desc)
519{
520}
Mike Travis7f7ace02009-01-10 21:58:08 -0800521#endif /* CONFIG_SMP */
522
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700523#endif /* _LINUX_IRQ_H */