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/smp.h>
16 #include <linux/linkage.h>
17 #include <linux/cache.h>
18 #include <linux/spinlock.h>
19 #include <linux/cpumask.h>
20 #include <linux/irqreturn.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 #ifdef 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 {
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 *chip;
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;
83 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
84 unsigned int move_irq; /* Flag need to re-target intr dest*/
86 } ____cacheline_aligned irq_desc_t;
88 extern irq_desc_t irq_desc [NR_IRQS];
90 #include <asm/hw_irq.h> /* the arch dependent stuff */
92 extern int setup_irq(unsigned int irq, struct irqaction *new);
94 #ifdef CONFIG_GENERIC_HARDIRQS
97 static inline void set_native_irq_info(int irq, cpumask_t mask)
99 irq_desc[irq].affinity = mask;
102 static inline void set_native_irq_info(int irq, cpumask_t mask)
109 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
110 extern cpumask_t pending_irq_cpumask[NR_IRQS];
112 void set_pending_irq(unsigned int irq, cpumask_t mask);
113 void move_native_irq(int irq);
115 #ifdef CONFIG_PCI_MSI
117 * Wonder why these are dummies?
118 * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
119 * counter part after translating the vector to irq info. We need to perform
120 * this operation on the real irq, when we dont use vector, i.e when
121 * pci_use_vector() is false.
123 static inline void move_irq(int irq)
127 static inline void set_irq_info(int irq, cpumask_t mask)
131 #else /* CONFIG_PCI_MSI */
133 static inline void move_irq(int irq)
135 move_native_irq(irq);
138 static inline void set_irq_info(int irq, cpumask_t mask)
140 set_native_irq_info(irq, mask);
143 #endif /* CONFIG_PCI_MSI */
145 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
147 static inline void move_irq(int irq)
151 static inline void move_native_irq(int irq)
155 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
159 static inline void set_irq_info(int irq, cpumask_t mask)
161 set_native_irq_info(irq, mask);
164 #endif /* CONFIG_GENERIC_PENDING_IRQ */
166 #else /* CONFIG_SMP */
169 #define move_native_irq(x)
171 #endif /* CONFIG_SMP */
173 #ifdef CONFIG_IRQBALANCE
174 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
176 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
181 extern int no_irq_affinity;
182 extern int noirqdebug_setup(char *str);
184 extern irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
185 struct irqaction *action);
187 * Explicit fastcall, because i386 4KSTACKS calls it from assembly:
189 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
191 extern void note_interrupt(unsigned int irq, irq_desc_t *desc,
192 int action_ret, struct pt_regs *regs);
193 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
195 extern void init_irq_proc(void);
197 #ifdef CONFIG_AUTO_IRQ_AFFINITY
198 extern int select_smp_affinity(unsigned int irq);
200 static inline int select_smp_affinity(unsigned int irq)
206 #endif /* CONFIG_GENERIC_HARDIRQS */
208 extern hw_irq_controller no_irq_type; /* needed in every arch ? */
210 #endif /* !CONFIG_S390 */
212 #endif /* _LINUX_IRQ_H */