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 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
119 irq_desc_t *desc = irq_desc + irq;
122 spin_lock_irqsave(&desc->lock, flags);
124 pending_irq_cpumask[irq] = mask;
125 spin_unlock_irqrestore(&desc->lock, flags);
129 move_native_irq(int irq)
132 irq_desc_t *desc = irq_descp(irq);
134 if (likely (!desc->move_irq))
139 if (likely(cpus_empty(pending_irq_cpumask[irq])))
142 if (!desc->handler->set_affinity)
145 /* note - we hold the desc->lock */
146 cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
149 * If there was a valid mask to work with, please
150 * do the disable, re-program, enable sequence.
151 * This is *not* particularly important for level triggered
152 * but in a edge trigger case, we might be setting rte
153 * when an active trigger is comming in. This could
154 * cause some ioapics to mal-function.
155 * Being paranoid i guess!
157 if (unlikely(!cpus_empty(tmp))) {
158 desc->handler->disable(irq);
159 desc->handler->set_affinity(irq,tmp);
160 desc->handler->enable(irq);
162 cpus_clear(pending_irq_cpumask[irq]);
165 #ifdef CONFIG_PCI_MSI
167 * Wonder why these are dummies?
168 * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
169 * counter part after translating the vector to irq info. We need to perform
170 * this operation on the real irq, when we dont use vector, i.e when
171 * pci_use_vector() is false.
173 static inline void move_irq(int irq)
177 static inline void set_irq_info(int irq, cpumask_t mask)
181 #else // CONFIG_PCI_MSI
183 static inline void move_irq(int irq)
185 move_native_irq(irq);
188 static inline void set_irq_info(int irq, cpumask_t mask)
190 set_native_irq_info(irq, mask);
192 #endif // CONFIG_PCI_MSI
194 #else // CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE
197 #define move_native_irq(x)
198 #define set_pending_irq(x,y)
199 static inline void set_irq_info(int irq, cpumask_t mask)
201 set_native_irq_info(irq, mask);
204 #endif // CONFIG_GENERIC_PENDING_IRQ
209 #define move_native_irq(x)
213 extern int no_irq_affinity;
214 extern int noirqdebug_setup(char *str);
216 extern fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
217 struct irqaction *action);
218 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
219 extern void note_interrupt(unsigned int irq, irq_desc_t *desc,
220 int action_ret, struct pt_regs *regs);
221 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
223 extern void init_irq_proc(void);
225 #ifdef CONFIG_AUTO_IRQ_AFFINITY
226 extern int select_smp_affinity(unsigned int irq);
229 select_smp_affinity(unsigned int irq)
237 extern hw_irq_controller no_irq_type; /* needed in every arch ? */