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;
64 struct proc_dir_entry;
67 * This is the "IRQ descriptor", which contains various information
68 * about the irq, including what kind of hardware handling it has,
69 * whether it is disabled etc etc.
71 * Pad this out to 32 bytes for cache and indexing reasons.
74 hw_irq_controller *chip;
76 struct irqaction *action; /* IRQ action list */
77 unsigned int status; /* IRQ status */
78 unsigned int depth; /* nested irq disables */
79 unsigned int irq_count; /* For detecting broken IRQs */
80 unsigned int irqs_unhandled;
85 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
86 unsigned int move_irq; /* need to re-target IRQ dest */
89 struct proc_dir_entry *dir;
91 } ____cacheline_aligned;
93 extern struct irq_desc irq_desc[NR_IRQS];
96 * Migration helpers for obsolete names, they will go away:
98 typedef struct irq_desc irq_desc_t;
101 * Pick up the arch-dependent methods:
103 #include <asm/hw_irq.h>
105 extern int setup_irq(unsigned int irq, struct irqaction *new);
107 #ifdef CONFIG_GENERIC_HARDIRQS
110 static inline void set_native_irq_info(int irq, cpumask_t mask)
112 irq_desc[irq].affinity = mask;
115 static inline void set_native_irq_info(int irq, cpumask_t mask)
122 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
123 extern cpumask_t pending_irq_cpumask[NR_IRQS];
125 void set_pending_irq(unsigned int irq, cpumask_t mask);
126 void move_native_irq(int irq);
128 #ifdef CONFIG_PCI_MSI
130 * Wonder why these are dummies?
131 * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
132 * counter part after translating the vector to irq info. We need to perform
133 * this operation on the real irq, when we dont use vector, i.e when
134 * pci_use_vector() is false.
136 static inline void move_irq(int irq)
140 static inline void set_irq_info(int irq, cpumask_t mask)
144 #else /* CONFIG_PCI_MSI */
146 static inline void move_irq(int irq)
148 move_native_irq(irq);
151 static inline void set_irq_info(int irq, cpumask_t mask)
153 set_native_irq_info(irq, mask);
156 #endif /* CONFIG_PCI_MSI */
158 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
160 static inline void move_irq(int irq)
164 static inline void move_native_irq(int irq)
168 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
172 static inline void set_irq_info(int irq, cpumask_t mask)
174 set_native_irq_info(irq, mask);
177 #endif /* CONFIG_GENERIC_PENDING_IRQ */
179 #else /* CONFIG_SMP */
182 #define move_native_irq(x)
184 #endif /* CONFIG_SMP */
186 #ifdef CONFIG_IRQBALANCE
187 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
189 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
194 #ifdef CONFIG_AUTO_IRQ_AFFINITY
195 extern int select_smp_affinity(unsigned int irq);
197 static inline int select_smp_affinity(unsigned int irq)
203 extern int no_irq_affinity;
204 extern int noirqdebug_setup(char *str);
206 extern irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
207 struct irqaction *action);
209 * Explicit fastcall, because i386 4KSTACKS calls it from assembly:
211 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
213 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
214 int action_ret, struct pt_regs *regs);
215 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
217 extern void init_irq_proc(void);
219 #endif /* CONFIG_GENERIC_HARDIRQS */
221 extern hw_irq_controller no_irq_type; /* needed in every arch ? */
223 #endif /* !CONFIG_S390 */
225 #endif /* _LINUX_IRQ_H */