include/linux/irq.h

   1 #ifndef _LINUX_IRQ_H
   2 #define _LINUX_IRQ_H
   3
   4 /*
   5  * Please do not include this file in generic code.  There is currently
   6  * no requirement for any architecture to implement anything held
   7  * within this file.
   8  *
   9  * Thanks. --rmk
  10  */
  11
  12 #include <linux/smp.h>
  13
  14 #ifndef CONFIG_S390
  15
  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>
  21
  22 #include <asm/irq.h>
  23 #include <asm/ptrace.h>
  24
  25 /*
  26  * IRQ line status.
  27  */
  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)
  39 #else
  40 # define CHECK_IRQ_PER_CPU(var) 0
  41 #endif
  42
  43 /*
  44  * Interrupt controller descriptor. This is all we need
  45  * to describe about the low-level hardware.
  46  */
  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);
  59 #endif
  60 };
  61
  62 typedef struct hw_interrupt_type  hw_irq_controller;
  63
  64 struct proc_dir_entry;
  65
  66 /*
  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.
  70  *
  71  * Pad this out to 32 bytes for cache and indexing reasons.
  72  */
  73 struct irq_desc {
  74         hw_irq_controller       *chip;
  75         void                    *chip_data;
  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;
  81         spinlock_t              lock;
  82 #ifdef CONFIG_SMP
  83         cpumask_t               affinity;
  84 #endif
  85 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
  86         cpumask_t               pending_mask;
  87         unsigned int            move_irq;       /* need to re-target IRQ dest */
  88 #endif
  89 #ifdef CONFIG_PROC_FS
  90         struct proc_dir_entry *dir;
  91 #endif
  92 } ____cacheline_aligned;
  93
  94 extern struct irq_desc irq_desc[NR_IRQS];
  95
  96 /*
  97  * Migration helpers for obsolete names, they will go away:
  98  */
  99 typedef struct irq_desc         irq_desc_t;
 100
 101 /*
 102  * Pick up the arch-dependent methods:
 103  */
 104 #include <asm/hw_irq.h>
 105
 106 extern int setup_irq(unsigned int irq, struct irqaction *new);
 107
 108 #ifdef CONFIG_GENERIC_HARDIRQS
 109
 110 #ifdef CONFIG_SMP
 111 static inline void set_native_irq_info(int irq, cpumask_t mask)
 112 {
 113         irq_desc[irq].affinity = mask;
 114 }
 115 #else
 116 static inline void set_native_irq_info(int irq, cpumask_t mask)
 117 {
 118 }
 119 #endif
 120
 121 #ifdef CONFIG_SMP
 122
 123 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 124
 125 void set_pending_irq(unsigned int irq, cpumask_t mask);
 126 void move_native_irq(int irq);
 127
 128 #ifdef CONFIG_PCI_MSI
 129 /*
 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.
 135  */
 136 static inline void move_irq(int irq)
 137 {
 138 }
 139
 140 static inline void set_irq_info(int irq, cpumask_t mask)
 141 {
 142 }
 143
 144 #else /* CONFIG_PCI_MSI */
 145
 146 static inline void move_irq(int irq)
 147 {
 148         move_native_irq(irq);
 149 }
 150
 151 static inline void set_irq_info(int irq, cpumask_t mask)
 152 {
 153         set_native_irq_info(irq, mask);
 154 }
 155
 156 #endif /* CONFIG_PCI_MSI */
 157
 158 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
 159
 160 static inline void move_irq(int irq)
 161 {
 162 }
 163
 164 static inline void move_native_irq(int irq)
 165 {
 166 }
 167
 168 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
 169 {
 170 }
 171
 172 static inline void set_irq_info(int irq, cpumask_t mask)
 173 {
 174         set_native_irq_info(irq, mask);
 175 }
 176
 177 #endif /* CONFIG_GENERIC_PENDING_IRQ */
 178
 179 #else /* CONFIG_SMP */
 180
 181 #define move_irq(x)
 182 #define move_native_irq(x)
 183
 184 #endif /* CONFIG_SMP */
 185
 186 #ifdef CONFIG_IRQBALANCE
 187 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
 188 #else
 189 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
 190 {
 191 }
 192 #endif
 193
 194 #ifdef CONFIG_AUTO_IRQ_AFFINITY
 195 extern int select_smp_affinity(unsigned int irq);
 196 #else
 197 static inline int select_smp_affinity(unsigned int irq)
 198 {
 199         return 1;
 200 }
 201 #endif
 202
 203 extern int no_irq_affinity;
 204 extern int noirqdebug_setup(char *str);
 205
 206 extern irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
 207                                     struct irqaction *action);
 208 /*
 209  * Explicit fastcall, because i386 4KSTACKS calls it from assembly:
 210  */
 211 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
 212
 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);
 216
 217 extern void init_irq_proc(void);
 218
 219 #endif /* CONFIG_GENERIC_HARDIRQS */
 220
 221 extern hw_irq_controller no_irq_type;  /* needed in every arch ? */
 222
 223 #endif /* !CONFIG_S390 */
 224
 225 #endif /* _LINUX_IRQ_H */