5 * Please do not include this file in generic code. There is currently
6 * no requirement for any architecture to implement anything held
12 #include <linux/config.h>
13 #include <linux/smp.h>
15 #if !defined(CONFIG_S390)
17 #include <linux/linkage.h>
18 #include <linux/cache.h>
19 #include <linux/spinlock.h>
20 #include <linux/cpumask.h>
23 #include <asm/ptrace.h>
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)
40 # define CHECK_IRQ_PER_CPU(var) 0
44 * Interrupt controller descriptor. This is all we need
45 * to describe about the low-level hardware.
47 struct 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
);
62 typedef struct hw_interrupt_type hw_irq_controller
;
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.
69 * Pad this out to 32 bytes for cache and indexing reasons.
71 typedef struct irq_desc
{
72 hw_irq_controller
*handler
;
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
;
80 #if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
81 unsigned int move_irq
; /* Flag need to re-target intr dest*/
83 } ____cacheline_aligned irq_desc_t
;
85 extern irq_desc_t irq_desc
[NR_IRQS
];
87 /* Return a pointer to the irq descriptor for IRQ. */
88 static inline irq_desc_t
*
91 return irq_desc
+ irq
;
94 #include <asm/hw_irq.h> /* the arch dependent stuff */
96 extern int setup_irq(unsigned int irq
, struct irqaction
* new);
98 #ifdef CONFIG_GENERIC_HARDIRQS
99 extern cpumask_t irq_affinity
[NR_IRQS
];
102 static inline void set_native_irq_info(int irq
, cpumask_t mask
)
104 irq_affinity
[irq
] = mask
;
107 static inline void set_native_irq_info(int irq
, cpumask_t mask
)
114 #if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
115 extern cpumask_t pending_irq_cpumask
[NR_IRQS
];
117 void set_pending_irq(unsigned int irq
, cpumask_t mask
);
118 void move_native_irq(int irq
);
120 #ifdef CONFIG_PCI_MSI
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.
128 static inline void move_irq(int irq
)
132 static inline void set_irq_info(int irq
, cpumask_t mask
)
136 #else // CONFIG_PCI_MSI
138 static inline void move_irq(int irq
)
140 move_native_irq(irq
);
143 static inline void set_irq_info(int irq
, cpumask_t mask
)
145 set_native_irq_info(irq
, mask
);
147 #endif // CONFIG_PCI_MSI
149 #else // CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE
152 #define move_native_irq(x)
153 #define set_pending_irq(x,y)
154 static inline void set_irq_info(int irq
, cpumask_t mask
)
156 set_native_irq_info(irq
, mask
);
159 #endif // CONFIG_GENERIC_PENDING_IRQ
164 #define move_native_irq(x)
168 extern int no_irq_affinity
;
169 extern int noirqdebug_setup(char *str
);
171 extern fastcall
int handle_IRQ_event(unsigned int irq
, struct pt_regs
*regs
,
172 struct irqaction
*action
);
173 extern fastcall
unsigned int __do_IRQ(unsigned int irq
, struct pt_regs
*regs
);
174 extern void note_interrupt(unsigned int irq
, irq_desc_t
*desc
,
175 int action_ret
, struct pt_regs
*regs
);
176 extern int can_request_irq(unsigned int irq
, unsigned long irqflags
);
178 extern void init_irq_proc(void);
180 #ifdef CONFIG_AUTO_IRQ_AFFINITY
181 extern int select_smp_affinity(unsigned int irq
);
184 select_smp_affinity(unsigned int irq
)
192 extern hw_irq_controller no_irq_type
; /* needed in every arch ? */