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  * Bits 0-16 are reserved for the IRQF_* bits in linux/interrupt.h
  29  *
  30  * IRQ types
  31  */
  32 #define IRQ_TYPE_NONE           0x00000000      /* Default, unspecified type */
  33 #define IRQ_TYPE_EDGE_RISING    0x00000001      /* Edge rising type */
  34 #define IRQ_TYPE_EDGE_FALLING   0x00000002      /* Edge falling type */
  35 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
  36 #define IRQ_TYPE_LEVEL_HIGH     0x00000004      /* Level high type */
  37 #define IRQ_TYPE_LEVEL_LOW      0x00000008      /* Level low type */
  38 #define IRQ_TYPE_SENSE_MASK     0x0000000f      /* Mask of the above */
  39 #define IRQ_TYPE_PROBE          0x00000010      /* Probing in progress */
  40
  41 /* Internal flags */
  42 #define IRQ_INPROGRESS          0x00010000      /* IRQ handler active - do not enter! */
  43 #define IRQ_DISABLED            0x00020000      /* IRQ disabled - do not enter! */
  44 #define IRQ_PENDING             0x00040000      /* IRQ pending - replay on enable */
  45 #define IRQ_REPLAY              0x00080000      /* IRQ has been replayed but not acked yet */
  46 #define IRQ_AUTODETECT          0x00100000      /* IRQ is being autodetected */
  47 #define IRQ_WAITING             0x00200000      /* IRQ not yet seen - for autodetection */
  48 #define IRQ_LEVEL               0x00400000      /* IRQ level triggered */
  49 #define IRQ_MASKED              0x00800000      /* IRQ masked - shouldn't be seen again */
  50 #ifdef CONFIG_IRQ_PER_CPU
  51 # define IRQ_PER_CPU            0x01000000      /* IRQ is per CPU */
  52 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
  53 #else
  54 # define CHECK_IRQ_PER_CPU(var) 0
  55 #endif
  56
  57 #define IRQ_NOPROBE             0x02000000      /* IRQ is not valid for probing */
  58 #define IRQ_NOREQUEST           0x04000000      /* IRQ cannot be requested */
  59 #define IRQ_NOAUTOEN            0x08000000      /* IRQ will not be enabled on request irq */
  60 #define IRQ_DELAYED_DISABLE     0x10000000      /* IRQ disable (masking) happens delayed. */
  61
  62 struct proc_dir_entry;
  63
  64 /**
  65  * struct irq_chip - hardware interrupt chip descriptor
  66  *
  67  * @name:               name for /proc/interrupts
  68  * @startup:            start up the interrupt (defaults to ->enable if NULL)
  69  * @shutdown:           shut down the interrupt (defaults to ->disable if NULL)
  70  * @enable:             enable the interrupt (defaults to chip->unmask if NULL)
  71  * @disable:            disable the interrupt (defaults to chip->mask if NULL)
  72  * @ack:                start of a new interrupt
  73  * @mask:               mask an interrupt source
  74  * @mask_ack:           ack and mask an interrupt source
  75  * @unmask:             unmask an interrupt source
  76  * @eoi:                end of interrupt - chip level
  77  * @end:                end of interrupt - flow level
  78  * @set_affinity:       set the CPU affinity on SMP machines
  79  * @retrigger:          resend an IRQ to the CPU
  80  * @set_type:           set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
  81  * @set_wake:           enable/disable power-management wake-on of an IRQ
  82  *
  83  * @release:            release function solely used by UML
  84  * @typename:           obsoleted by name, kept as migration helper
  85  */
  86 struct irq_chip {
  87         const char      *name;
  88         unsigned int    (*startup)(unsigned int irq);
  89         void            (*shutdown)(unsigned int irq);
  90         void            (*enable)(unsigned int irq);
  91         void            (*disable)(unsigned int irq);
  92
  93         void            (*ack)(unsigned int irq);
  94         void            (*mask)(unsigned int irq);
  95         void            (*mask_ack)(unsigned int irq);
  96         void            (*unmask)(unsigned int irq);
  97         void            (*eoi)(unsigned int irq);
  98
  99         void            (*end)(unsigned int irq);
 100         void            (*set_affinity)(unsigned int irq, cpumask_t dest);
 101         int             (*retrigger)(unsigned int irq);
 102         int             (*set_type)(unsigned int irq, unsigned int flow_type);
 103         int             (*set_wake)(unsigned int irq, unsigned int on);
 104
 105         /* Currently used only by UML, might disappear one day.*/
 106 #ifdef CONFIG_IRQ_RELEASE_METHOD
 107         void            (*release)(unsigned int irq, void *dev_id);
 108 #endif
 109         /*
 110          * For compatibility, ->typename is copied into ->name.
 111          * Will disappear.
 112          */
 113         const char      *typename;
 114 };
 115
 116 /**
 117  * struct irq_desc - interrupt descriptor
 118  *
 119  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
 120  * @chip:               low level interrupt hardware access
 121  * @handler_data:       per-IRQ data for the irq_chip methods
 122  * @chip_data:          platform-specific per-chip private data for the chip
 123  *                      methods, to allow shared chip implementations
 124  * @action:             the irq action chain
 125  * @status:             status information
 126  * @depth:              disable-depth, for nested irq_disable() calls
 127  * @irq_count:          stats field to detect stalled irqs
 128  * @irqs_unhandled:     stats field for spurious unhandled interrupts
 129  * @lock:               locking for SMP
 130  * @affinity:           IRQ affinity on SMP
 131  * @cpu:                cpu index useful for balancing
 132  * @pending_mask:       pending rebalanced interrupts
 133  * @move_irq:           need to re-target IRQ destination
 134  * @dir:                /proc/irq/ procfs entry
 135  * @affinity_entry:     /proc/irq/smp_affinity procfs entry on SMP
 136  *
 137  * Pad this out to 32 bytes for cache and indexing reasons.
 138  */
 139 struct irq_desc {
 140         void fastcall           (*handle_irq)(unsigned int irq,
 141                                               struct irq_desc *desc,
 142                                               struct pt_regs *regs);
 143         struct irq_chip         *chip;
 144         void                    *handler_data;
 145         void                    *chip_data;
 146         struct irqaction        *action;        /* IRQ action list */
 147         unsigned int            status;         /* IRQ status */
 148
 149         unsigned int            depth;          /* nested irq disables */
 150         unsigned int            irq_count;      /* For detecting broken IRQs */
 151         unsigned int            irqs_unhandled;
 152         spinlock_t              lock;
 153 #ifdef CONFIG_SMP
 154         cpumask_t               affinity;
 155         unsigned int            cpu;
 156 #endif
 157 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 158         cpumask_t               pending_mask;
 159         unsigned int            move_irq;       /* need to re-target IRQ dest */
 160 #endif
 161 #ifdef CONFIG_PROC_FS
 162         struct proc_dir_entry *dir;
 163 #endif
 164 } ____cacheline_aligned;
 165
 166 extern struct irq_desc irq_desc[NR_IRQS];
 167
 168 /*
 169  * Migration helpers for obsolete names, they will go away:
 170  */
 171 #define hw_interrupt_type       irq_chip
 172 typedef struct irq_chip         hw_irq_controller;
 173 #define no_irq_type             no_irq_chip
 174 typedef struct irq_desc         irq_desc_t;
 175
 176 /*
 177  * Pick up the arch-dependent methods:
 178  */
 179 #include <asm/hw_irq.h>
 180
 181 extern int setup_irq(unsigned int irq, struct irqaction *new);
 182
 183 #ifdef CONFIG_GENERIC_HARDIRQS
 184
 185 #ifdef CONFIG_SMP
 186 static inline void set_native_irq_info(int irq, cpumask_t mask)
 187 {
 188         irq_desc[irq].affinity = mask;
 189 }
 190 #else
 191 static inline void set_native_irq_info(int irq, cpumask_t mask)
 192 {
 193 }
 194 #endif
 195
 196 #ifdef CONFIG_SMP
 197
 198 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 199
 200 void set_pending_irq(unsigned int irq, cpumask_t mask);
 201 void move_native_irq(int irq);
 202
 203 #ifdef CONFIG_PCI_MSI
 204 /*
 205  * Wonder why these are dummies?
 206  * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
 207  * counter part after translating the vector to irq info. We need to perform
 208  * this operation on the real irq, when we dont use vector, i.e when
 209  * pci_use_vector() is false.
 210  */
 211 static inline void move_irq(int irq)
 212 {
 213 }
 214
 215 static inline void set_irq_info(int irq, cpumask_t mask)
 216 {
 217 }
 218
 219 #else /* CONFIG_PCI_MSI */
 220
 221 static inline void move_irq(int irq)
 222 {
 223         move_native_irq(irq);
 224 }
 225
 226 static inline void set_irq_info(int irq, cpumask_t mask)
 227 {
 228         set_native_irq_info(irq, mask);
 229 }
 230
 231 #endif /* CONFIG_PCI_MSI */
 232
 233 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
 234
 235 static inline void move_irq(int irq)
 236 {
 237 }
 238
 239 static inline void move_native_irq(int irq)
 240 {
 241 }
 242
 243 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
 244 {
 245 }
 246
 247 static inline void set_irq_info(int irq, cpumask_t mask)
 248 {
 249         set_native_irq_info(irq, mask);
 250 }
 251
 252 #endif /* CONFIG_GENERIC_PENDING_IRQ */
 253
 254 #else /* CONFIG_SMP */
 255
 256 #define move_irq(x)
 257 #define move_native_irq(x)
 258
 259 #endif /* CONFIG_SMP */
 260
 261 #ifdef CONFIG_IRQBALANCE
 262 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
 263 #else
 264 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
 265 {
 266 }
 267 #endif
 268
 269 #ifdef CONFIG_AUTO_IRQ_AFFINITY
 270 extern int select_smp_affinity(unsigned int irq);
 271 #else
 272 static inline int select_smp_affinity(unsigned int irq)
 273 {
 274         return 1;
 275 }
 276 #endif
 277
 278 extern int no_irq_affinity;
 279
 280 /* Handle irq action chains: */
 281 extern int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
 282                             struct irqaction *action);
 283
 284 /*
 285  * Built-in IRQ handlers for various IRQ types,
 286  * callable via desc->chip->handle_irq()
 287  */
 288 extern void fastcall
 289 handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
 290 extern void fastcall
 291 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc,
 292                          struct pt_regs *regs);
 293 extern void fastcall
 294 handle_edge_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
 295 extern void fastcall
 296 handle_simple_irq(unsigned int irq, struct irq_desc *desc,
 297                   struct pt_regs *regs);
 298 extern void fastcall
 299 handle_percpu_irq(unsigned int irq, struct irq_desc *desc,
 300                   struct pt_regs *regs);
 301 extern void fastcall
 302 handle_bad_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
 303
 304 /*
 305  * Get a descriptive string for the highlevel handler, for
 306  * /proc/interrupts output:
 307  */
 308 extern const char *
 309 handle_irq_name(void fastcall (*handle)(unsigned int, struct irq_desc *,
 310                                         struct pt_regs *));
 311
 312 /*
 313  * Monolithic do_IRQ implementation.
 314  * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
 315  */
 316 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
 317
 318 /*
 319  * Architectures call this to let the generic IRQ layer
 320  * handle an interrupt. If the descriptor is attached to an
 321  * irqchip-style controller then we call the ->handle_irq() handler,
 322  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 323  */
 324 static inline void generic_handle_irq(unsigned int irq, struct pt_regs *regs)
 325 {
 326         struct irq_desc *desc = irq_desc + irq;
 327
 328         if (likely(desc->handle_irq))
 329                 desc->handle_irq(irq, desc, regs);
 330         else
 331                 __do_IRQ(irq, regs);
 332 }
 333
 334 /* Handling of unhandled and spurious interrupts: */
 335 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 336                            int action_ret, struct pt_regs *regs);
 337
 338 /* Resending of interrupts :*/
 339 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
 340
 341 /* Initialize /proc/irq/ */
 342 extern void init_irq_proc(void);
 343
 344 /* Enable/disable irq debugging output: */
 345 extern int noirqdebug_setup(char *str);
 346
 347 /* Checks whether the interrupt can be requested by request_irq(): */
 348 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 349
 350 /* Dummy irq-chip implementation: */
 351 extern struct irq_chip no_irq_chip;
 352
 353 extern void
 354 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 355                          void fastcall (*handle)(unsigned int,
 356                                                  struct irq_desc *,
 357                                                  struct pt_regs *));
 358 extern void
 359 __set_irq_handler(unsigned int irq,
 360                   void fastcall (*handle)(unsigned int, struct irq_desc *,
 361                                           struct pt_regs *),
 362                   int is_chained);
 363
 364 /*
 365  * Set a highlevel flow handler for a given IRQ:
 366  */
 367 static inline void
 368 set_irq_handler(unsigned int irq,
 369                 void fastcall (*handle)(unsigned int, struct irq_desc *,
 370                                         struct pt_regs *))
 371 {
 372         __set_irq_handler(irq, handle, 0);
 373 }
 374
 375 /*
 376  * Set a highlevel chained flow handler for a given IRQ.
 377  * (a chained handler is automatically enabled and set to
 378  *  IRQ_NOREQUEST and IRQ_NOPROBE)
 379  */
 380 static inline void
 381 set_irq_chained_handler(unsigned int irq,
 382                         void fastcall (*handle)(unsigned int, struct irq_desc *,
 383                                                 struct pt_regs *))
 384 {
 385         __set_irq_handler(irq, handle, 1);
 386 }
 387
 388 /* Set/get chip/data for an IRQ: */
 389
 390 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
 391 extern int set_irq_data(unsigned int irq, void *data);
 392 extern int set_irq_chip_data(unsigned int irq, void *data);
 393 extern int set_irq_type(unsigned int irq, unsigned int type);
 394
 395 #define get_irq_chip(irq)       (irq_desc[irq].chip)
 396 #define get_irq_chip_data(irq)  (irq_desc[irq].chip_data)
 397 #define get_irq_data(irq)       (irq_desc[irq].handler_data)
 398
 399 #endif /* CONFIG_GENERIC_HARDIRQS */
 400
 401 #endif /* !CONFIG_S390 */
 402
 403 #endif /* _LINUX_IRQ_H */