Linux kernel mirror (for testing)
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linux
1#ifndef __irq_h
2#define __irq_h
3
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
12#include <linux/config.h>
13#include <linux/smp.h>
14
15#if !defined(CONFIG_S390)
16
17#include <linux/linkage.h>
18#include <linux/cache.h>
19#include <linux/spinlock.h>
20#include <linux/cpumask.h>
21
22#include <asm/irq.h>
23#include <asm/ptrace.h>
24
25/*
26 * IRQ line status.
27 */
28#define IRQ_INPROGRESS 1 /* IRQ handler active - do not enter! */
29#define IRQ_DISABLED 2 /* IRQ disabled - do not enter! */
30#define IRQ_PENDING 4 /* IRQ pending - replay on enable */
31#define IRQ_REPLAY 8 /* IRQ has been replayed but not acked yet */
32#define IRQ_AUTODETECT 16 /* IRQ is being autodetected */
33#define IRQ_WAITING 32 /* IRQ not yet seen - for autodetection */
34#define IRQ_LEVEL 64 /* IRQ level triggered */
35#define IRQ_MASKED 128 /* IRQ masked - shouldn't be seen again */
36#if defined(ARCH_HAS_IRQ_PER_CPU)
37# define IRQ_PER_CPU 256 /* IRQ is per CPU */
38# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
39#else
40# define CHECK_IRQ_PER_CPU(var) 0
41#endif
42
43/*
44 * Interrupt controller descriptor. This is all we need
45 * to describe about the low-level hardware.
46 */
47struct hw_interrupt_type {
48 const char * typename;
49 unsigned int (*startup)(unsigned int irq);
50 void (*shutdown)(unsigned int irq);
51 void (*enable)(unsigned int irq);
52 void (*disable)(unsigned int irq);
53 void (*ack)(unsigned int irq);
54 void (*end)(unsigned int irq);
55 void (*set_affinity)(unsigned int irq, cpumask_t dest);
56 /* Currently used only by UML, might disappear one day.*/
57#ifdef CONFIG_IRQ_RELEASE_METHOD
58 void (*release)(unsigned int irq, void *dev_id);
59#endif
60};
61
62typedef struct hw_interrupt_type hw_irq_controller;
63
64/*
65 * This is the "IRQ descriptor", which contains various information
66 * about the irq, including what kind of hardware handling it has,
67 * whether it is disabled etc etc.
68 *
69 * Pad this out to 32 bytes for cache and indexing reasons.
70 */
71typedef struct irq_desc {
72 hw_irq_controller *handler;
73 void *handler_data;
74 struct irqaction *action; /* IRQ action list */
75 unsigned int status; /* IRQ status */
76 unsigned int depth; /* nested irq disables */
77 unsigned int irq_count; /* For detecting broken interrupts */
78 unsigned int irqs_unhandled;
79 spinlock_t lock;
80#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
81 unsigned int move_irq; /* Flag need to re-target intr dest*/
82#endif
83} ____cacheline_aligned irq_desc_t;
84
85extern irq_desc_t irq_desc [NR_IRQS];
86
87/* Return a pointer to the irq descriptor for IRQ. */
88static inline irq_desc_t *
89irq_descp (int irq)
90{
91 return irq_desc + irq;
92}
93
94#include <asm/hw_irq.h> /* the arch dependent stuff */
95
96extern int setup_irq(unsigned int irq, struct irqaction * new);
97
98#ifdef CONFIG_GENERIC_HARDIRQS
99extern cpumask_t irq_affinity[NR_IRQS];
100
101#ifdef CONFIG_SMP
102static inline void set_native_irq_info(int irq, cpumask_t mask)
103{
104 irq_affinity[irq] = mask;
105}
106#else
107static inline void set_native_irq_info(int irq, cpumask_t mask)
108{
109}
110#endif
111
112#ifdef CONFIG_SMP
113
114#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
115extern cpumask_t pending_irq_cpumask[NR_IRQS];
116
117void set_pending_irq(unsigned int irq, cpumask_t mask);
118void move_native_irq(int irq);
119
120#ifdef CONFIG_PCI_MSI
121/*
122 * Wonder why these are dummies?
123 * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
124 * counter part after translating the vector to irq info. We need to perform
125 * this operation on the real irq, when we dont use vector, i.e when
126 * pci_use_vector() is false.
127 */
128static inline void move_irq(int irq)
129{
130}
131
132static inline void set_irq_info(int irq, cpumask_t mask)
133{
134}
135
136#else // CONFIG_PCI_MSI
137
138static inline void move_irq(int irq)
139{
140 move_native_irq(irq);
141}
142
143static inline void set_irq_info(int irq, cpumask_t mask)
144{
145 set_native_irq_info(irq, mask);
146}
147#endif // CONFIG_PCI_MSI
148
149#else // CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE
150
151#define move_irq(x)
152#define move_native_irq(x)
153#define set_pending_irq(x,y)
154static inline void set_irq_info(int irq, cpumask_t mask)
155{
156 set_native_irq_info(irq, mask);
157}
158
159#endif // CONFIG_GENERIC_PENDING_IRQ
160
161#else // CONFIG_SMP
162
163#define move_irq(x)
164#define move_native_irq(x)
165
166#endif // CONFIG_SMP
167
168extern int no_irq_affinity;
169extern int noirqdebug_setup(char *str);
170
171extern fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
172 struct irqaction *action);
173extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
174extern void note_interrupt(unsigned int irq, irq_desc_t *desc,
175 int action_ret, struct pt_regs *regs);
176extern int can_request_irq(unsigned int irq, unsigned long irqflags);
177
178extern void init_irq_proc(void);
179
180#ifdef CONFIG_AUTO_IRQ_AFFINITY
181extern int select_smp_affinity(unsigned int irq);
182#else
183static inline int
184select_smp_affinity(unsigned int irq)
185{
186 return 1;
187}
188#endif
189
190#endif
191
192extern hw_irq_controller no_irq_type; /* needed in every arch ? */
193
194#endif
195
196#endif /* __irq_h */