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 CONFIG_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
43 #define IRQ_NOPROBE 512 /* IRQ is not valid for probing */
45 * struct hw_interrupt_type - hardware interrupt type descriptor
47 * @name: name for /proc/interrupts
48 * @startup: start up the interrupt (defaults to ->enable if NULL)
49 * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
50 * @enable: enable the interrupt (defaults to chip->unmask if NULL)
51 * @disable: disable the interrupt (defaults to chip->mask if NULL)
52 * @handle_irq: irq flow handler called from the arch IRQ glue code
53 * @ack: start of a new interrupt
54 * @mask: mask an interrupt source
55 * @mask_ack: ack and mask an interrupt source
56 * @unmask: unmask an interrupt source
57 * @hold: same interrupt while the handler is running
58 * @end: end of interrupt
59 * @set_affinity: set the CPU affinity on SMP machines
60 * @retrigger: resend an IRQ to the CPU
61 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
62 * @set_wake: enable/disable power-management wake-on of an IRQ
64 * @release: release function solely used by UML
66 struct hw_interrupt_type {
68 unsigned int (*startup)(unsigned int irq);
69 void (*shutdown)(unsigned int irq);
70 void (*enable)(unsigned int irq);
71 void (*disable)(unsigned int irq);
72 void (*ack)(unsigned int irq);
73 void (*end)(unsigned int irq);
74 void (*set_affinity)(unsigned int irq, cpumask_t dest);
75 int (*retrigger)(unsigned int irq);
77 /* Currently used only by UML, might disappear one day.*/
78 #ifdef CONFIG_IRQ_RELEASE_METHOD
79 void (*release)(unsigned int irq, void *dev_id);
83 typedef struct hw_interrupt_type hw_irq_controller;
85 struct proc_dir_entry;
88 * struct irq_desc - interrupt descriptor
90 * @handler: interrupt type dependent handler functions
91 * @handler_data: data for the type handlers
92 * @action: the irq action chain
93 * @status: status information
94 * @depth: disable-depth, for nested irq_disable() calls
95 * @irq_count: stats field to detect stalled irqs
96 * @irqs_unhandled: stats field for spurious unhandled interrupts
97 * @lock: locking for SMP
98 * @affinity: IRQ affinity on SMP
99 * @pending_mask: pending rebalanced interrupts
100 * @move_irq: need to re-target IRQ destination
101 * @dir: /proc/irq/ procfs entry
102 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
104 * Pad this out to 32 bytes for cache and indexing reasons.
107 hw_irq_controller *chip;
109 struct irqaction *action; /* IRQ action list */
110 unsigned int status; /* IRQ status */
111 unsigned int depth; /* nested irq disables */
112 unsigned int irq_count; /* For detecting broken IRQs */
113 unsigned int irqs_unhandled;
118 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
119 cpumask_t pending_mask;
120 unsigned int move_irq; /* need to re-target IRQ dest */
122 #ifdef CONFIG_PROC_FS
123 struct proc_dir_entry *dir;
125 } ____cacheline_aligned;
127 extern struct irq_desc irq_desc[NR_IRQS];
130 * Migration helpers for obsolete names, they will go away:
132 typedef struct irq_desc irq_desc_t;
135 * Pick up the arch-dependent methods:
137 #include <asm/hw_irq.h>
139 extern int setup_irq(unsigned int irq, struct irqaction *new);
141 #ifdef CONFIG_GENERIC_HARDIRQS
144 static inline void set_native_irq_info(int irq, cpumask_t mask)
146 irq_desc[irq].affinity = mask;
149 static inline void set_native_irq_info(int irq, cpumask_t mask)
156 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
158 void set_pending_irq(unsigned int irq, cpumask_t mask);
159 void move_native_irq(int irq);
161 #ifdef CONFIG_PCI_MSI
163 * Wonder why these are dummies?
164 * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
165 * counter part after translating the vector to irq info. We need to perform
166 * this operation on the real irq, when we dont use vector, i.e when
167 * pci_use_vector() is false.
169 static inline void move_irq(int irq)
173 static inline void set_irq_info(int irq, cpumask_t mask)
177 #else /* CONFIG_PCI_MSI */
179 static inline void move_irq(int irq)
181 move_native_irq(irq);
184 static inline void set_irq_info(int irq, cpumask_t mask)
186 set_native_irq_info(irq, mask);
189 #endif /* CONFIG_PCI_MSI */
191 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
193 static inline void move_irq(int irq)
197 static inline void move_native_irq(int irq)
201 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
205 static inline void set_irq_info(int irq, cpumask_t mask)
207 set_native_irq_info(irq, mask);
210 #endif /* CONFIG_GENERIC_PENDING_IRQ */
212 #else /* CONFIG_SMP */
215 #define move_native_irq(x)
217 #endif /* CONFIG_SMP */
219 #ifdef CONFIG_IRQBALANCE
220 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
222 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
227 #ifdef CONFIG_AUTO_IRQ_AFFINITY
228 extern int select_smp_affinity(unsigned int irq);
230 static inline int select_smp_affinity(unsigned int irq)
236 extern int no_irq_affinity;
237 extern int noirqdebug_setup(char *str);
239 extern irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
240 struct irqaction *action);
242 * Explicit fastcall, because i386 4KSTACKS calls it from assembly:
244 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
246 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
247 int action_ret, struct pt_regs *regs);
248 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
250 /* Resending of interrupts :*/
251 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
253 extern void init_irq_proc(void);
255 #endif /* CONFIG_GENERIC_HARDIRQS */
257 extern hw_irq_controller no_irq_type; /* needed in every arch ? */
259 #endif /* !CONFIG_S390 */
261 #endif /* _LINUX_IRQ_H */