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>
14 #if !defined(CONFIG_ARCH_S390)
16 #include <linux/linkage.h>
17 #include <linux/cache.h>
18 #include <linux/spinlock.h>
19 #include <linux/cpumask.h>
22 #include <asm/ptrace.h>
27 #define IRQ_INPROGRESS 1 /* IRQ handler active - do not enter! */
28 #define IRQ_DISABLED 2 /* IRQ disabled - do not enter! */
29 #define IRQ_PENDING 4 /* IRQ pending - replay on enable */
30 #define IRQ_REPLAY 8 /* IRQ has been replayed but not acked yet */
31 #define IRQ_AUTODETECT 16 /* IRQ is being autodetected */
32 #define IRQ_WAITING 32 /* IRQ not yet seen - for autodetection */
33 #define IRQ_LEVEL 64 /* IRQ level triggered */
34 #define IRQ_MASKED 128 /* IRQ masked - shouldn't be seen again */
35 #if defined(ARCH_HAS_IRQ_PER_CPU)
36 # define IRQ_PER_CPU 256 /* IRQ is per CPU */
37 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
39 # define CHECK_IRQ_PER_CPU(var) 0
43 * Interrupt controller descriptor. This is all we need
44 * to describe about the low-level hardware.
46 struct hw_interrupt_type {
47 const char * typename;
48 unsigned int (*startup)(unsigned int irq);
49 void (*shutdown)(unsigned int irq);
50 void (*enable)(unsigned int irq);
51 void (*disable)(unsigned int irq);
52 void (*ack)(unsigned int irq);
53 void (*end)(unsigned int irq);
54 void (*set_affinity)(unsigned int irq, cpumask_t dest);
55 /* Currently used only by UML, might disappear one day.*/
56 #ifdef CONFIG_IRQ_RELEASE_METHOD
57 void (*release)(unsigned int irq, void *dev_id);
61 typedef struct hw_interrupt_type hw_irq_controller;
64 * This is the "IRQ descriptor", which contains various information
65 * about the irq, including what kind of hardware handling it has,
66 * whether it is disabled etc etc.
68 * Pad this out to 32 bytes for cache and indexing reasons.
70 typedef struct irq_desc {
71 hw_irq_controller *handler;
73 struct irqaction *action; /* IRQ action list */
74 unsigned int status; /* IRQ status */
75 unsigned int depth; /* nested irq disables */
76 unsigned int irq_count; /* For detecting broken interrupts */
77 unsigned int irqs_unhandled;
79 #if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
80 unsigned int move_irq; /* Flag need to re-target intr dest*/
82 } ____cacheline_aligned irq_desc_t;
84 extern irq_desc_t irq_desc [NR_IRQS];
86 /* Return a pointer to the irq descriptor for IRQ. */
87 static inline irq_desc_t *
90 return irq_desc + irq;
93 #include <asm/hw_irq.h> /* the arch dependent stuff */
95 extern int setup_irq(unsigned int irq, struct irqaction * new);
97 #ifdef CONFIG_GENERIC_HARDIRQS
98 extern cpumask_t irq_affinity[NR_IRQS];
101 static inline void set_native_irq_info(int irq, cpumask_t mask)
103 irq_affinity[irq] = mask;
106 static inline void set_native_irq_info(int irq, cpumask_t mask)
113 #if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
114 extern cpumask_t pending_irq_cpumask[NR_IRQS];
116 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
118 irq_desc_t *desc = irq_desc + irq;
121 spin_lock_irqsave(&desc->lock, flags);
123 pending_irq_cpumask[irq] = mask;
124 spin_unlock_irqrestore(&desc->lock, flags);
128 move_native_irq(int irq)
131 irq_desc_t *desc = irq_descp(irq);
133 if (likely (!desc->move_irq))
138 if (likely(cpus_empty(pending_irq_cpumask[irq])))
141 if (!desc->handler->set_affinity)
144 /* note - we hold the desc->lock */
145 cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
148 * If there was a valid mask to work with, please
149 * do the disable, re-program, enable sequence.
150 * This is *not* particularly important for level triggered
151 * but in a edge trigger case, we might be setting rte
152 * when an active trigger is comming in. This could
153 * cause some ioapics to mal-function.
154 * Being paranoid i guess!
156 if (unlikely(!cpus_empty(tmp))) {
157 desc->handler->disable(irq);
158 desc->handler->set_affinity(irq,tmp);
159 desc->handler->enable(irq);
161 cpus_clear(pending_irq_cpumask[irq]);
164 #ifdef CONFIG_PCI_MSI
166 * Wonder why these are dummies?
167 * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
168 * counter part after translating the vector to irq info. We need to perform
169 * this operation on the real irq, when we dont use vector, i.e when
170 * pci_use_vector() is false.
172 static inline void move_irq(int irq)
176 static inline void set_irq_info(int irq, cpumask_t mask)
180 #else // CONFIG_PCI_MSI
182 static inline void move_irq(int irq)
184 move_native_irq(irq);
187 static inline void set_irq_info(int irq, cpumask_t mask)
189 set_native_irq_info(irq, mask);
191 #endif // CONFIG_PCI_MSI
193 #else // CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE
196 #define move_native_irq(x)
197 #define set_pending_irq(x,y)
198 static inline void set_irq_info(int irq, cpumask_t mask)
200 set_native_irq_info(irq, mask);
203 #endif // CONFIG_GENERIC_PENDING_IRQ
208 #define move_native_irq(x)
212 extern int no_irq_affinity;
213 extern int noirqdebug_setup(char *str);
215 extern fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
216 struct irqaction *action);
217 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
218 extern void note_interrupt(unsigned int irq, irq_desc_t *desc,
219 int action_ret, struct pt_regs *regs);
220 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
222 extern void init_irq_proc(void);
225 extern hw_irq_controller no_irq_type; /* needed in every arch ? */