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 #define IRQ_PER_CPU             0x01000000      /* IRQ is per CPU */
  51 #ifdef CONFIG_IRQ_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 #define IRQ_WAKEUP              0x20000000      /* IRQ triggers system wakeup */
  62 #define IRQ_MOVE_PENDING        0x40000000      /* need to re-target IRQ destination */
  63
  64 struct proc_dir_entry;
  65
  66 /**
  67  * struct irq_chip - hardware interrupt chip descriptor
  68  *
  69  * @name:               name for /proc/interrupts
  70  * @startup:            start up the interrupt (defaults to ->enable if NULL)
  71  * @shutdown:           shut down the interrupt (defaults to ->disable if NULL)
  72  * @enable:             enable the interrupt (defaults to chip->unmask if NULL)
  73  * @disable:            disable the interrupt (defaults to chip->mask if NULL)
  74  * @ack:                start of a new interrupt
  75  * @mask:               mask an interrupt source
  76  * @mask_ack:           ack and mask an interrupt source
  77  * @unmask:             unmask an interrupt source
  78  * @eoi:                end of interrupt - chip level
  79  * @end:                end of interrupt - flow level
  80  * @set_affinity:       set the CPU affinity on SMP machines
  81  * @retrigger:          resend an IRQ to the CPU
  82  * @set_type:           set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
  83  * @set_wake:           enable/disable power-management wake-on of an IRQ
  84  *
  85  * @release:            release function solely used by UML
  86  * @typename:           obsoleted by name, kept as migration helper
  87  */
  88 struct irq_chip {
  89         const char      *name;
  90         unsigned int    (*startup)(unsigned int irq);
  91         void            (*shutdown)(unsigned int irq);
  92         void            (*enable)(unsigned int irq);
  93         void            (*disable)(unsigned int irq);
  94
  95         void            (*ack)(unsigned int irq);
  96         void            (*mask)(unsigned int irq);
  97         void            (*mask_ack)(unsigned int irq);
  98         void            (*unmask)(unsigned int irq);
  99         void            (*eoi)(unsigned int irq);
 100
 101         void            (*end)(unsigned int irq);
 102         void            (*set_affinity)(unsigned int irq, cpumask_t dest);
 103         int             (*retrigger)(unsigned int irq);
 104         int             (*set_type)(unsigned int irq, unsigned int flow_type);
 105         int             (*set_wake)(unsigned int irq, unsigned int on);
 106
 107         /* Currently used only by UML, might disappear one day.*/
 108 #ifdef CONFIG_IRQ_RELEASE_METHOD
 109         void            (*release)(unsigned int irq, void *dev_id);
 110 #endif
 111         /*
 112          * For compatibility, ->typename is copied into ->name.
 113          * Will disappear.
 114          */
 115         const char      *typename;
 116 };
 117
 118 /**
 119  * struct irq_desc - interrupt descriptor
 120  *
 121  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
 122  * @chip:               low level interrupt hardware access
 123  * @handler_data:       per-IRQ data for the irq_chip methods
 124  * @chip_data:          platform-specific per-chip private data for the chip
 125  *                      methods, to allow shared chip implementations
 126  * @action:             the irq action chain
 127  * @status:             status information
 128  * @depth:              disable-depth, for nested irq_disable() calls
 129  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
 130  * @irq_count:          stats field to detect stalled irqs
 131  * @irqs_unhandled:     stats field for spurious unhandled interrupts
 132  * @lock:               locking for SMP
 133  * @affinity:           IRQ affinity on SMP
 134  * @cpu:                cpu index useful for balancing
 135  * @pending_mask:       pending rebalanced interrupts
 136  * @dir:                /proc/irq/ procfs entry
 137  * @affinity_entry:     /proc/irq/smp_affinity procfs entry on SMP
 138  *
 139  * Pad this out to 32 bytes for cache and indexing reasons.
 140  */
 141 struct irq_desc {
 142         void fastcall           (*handle_irq)(unsigned int irq,
 143                                               struct irq_desc *desc,
 144                                               struct pt_regs *regs);
 145         struct irq_chip         *chip;
 146         void                    *handler_data;
 147         void                    *chip_data;
 148         struct irqaction        *action;        /* IRQ action list */
 149         unsigned int            status;         /* IRQ status */
 150
 151         unsigned int            depth;          /* nested irq disables */
 152         unsigned int            wake_depth;     /* nested wake enables */
 153         unsigned int            irq_count;      /* For detecting broken IRQs */
 154         unsigned int            irqs_unhandled;
 155         spinlock_t              lock;
 156 #ifdef CONFIG_SMP
 157         cpumask_t               affinity;
 158         unsigned int            cpu;
 159 #endif
 160 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 161         cpumask_t               pending_mask;
 162 #endif
 163 #ifdef CONFIG_PROC_FS
 164         struct proc_dir_entry *dir;
 165 #endif
 166 } ____cacheline_aligned;
 167
 168 extern struct irq_desc irq_desc[NR_IRQS];
 169
 170 /*
 171  * Migration helpers for obsolete names, they will go away:
 172  */
 173 #define hw_interrupt_type       irq_chip
 174 typedef struct irq_chip         hw_irq_controller;
 175 #define no_irq_type             no_irq_chip
 176 typedef struct irq_desc         irq_desc_t;
 177
 178 /*
 179  * Pick up the arch-dependent methods:
 180  */
 181 #include <asm/hw_irq.h>
 182
 183 extern int setup_irq(unsigned int irq, struct irqaction *new);
 184
 185 #ifdef CONFIG_GENERIC_HARDIRQS
 186
 187 #ifndef handle_dynamic_tick
 188 # define handle_dynamic_tick(a)         do { } while (0)
 189 #endif
 190
 191 #ifdef CONFIG_SMP
 192 static inline void set_native_irq_info(int irq, cpumask_t mask)
 193 {
 194         irq_desc[irq].affinity = mask;
 195 }
 196 #else
 197 static inline void set_native_irq_info(int irq, cpumask_t mask)
 198 {
 199 }
 200 #endif
 201
 202 #ifdef CONFIG_SMP
 203
 204 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 205
 206 void set_pending_irq(unsigned int irq, cpumask_t mask);
 207 void move_native_irq(int irq);
 208 void move_masked_irq(int irq);
 209
 210 #ifdef CONFIG_PCI_MSI
 211 /*
 212  * Wonder why these are dummies?
 213  * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
 214  * counter part after translating the vector to irq info. We need to perform
 215  * this operation on the real irq, when we dont use vector, i.e when
 216  * pci_use_vector() is false.
 217  */
 218 static inline void move_irq(int irq)
 219 {
 220 }
 221
 222 static inline void set_irq_info(int irq, cpumask_t mask)
 223 {
 224 }
 225
 226 #else /* CONFIG_PCI_MSI */
 227
 228 static inline void move_irq(int irq)
 229 {
 230         move_native_irq(irq);
 231 }
 232
 233 static inline void set_irq_info(int irq, cpumask_t mask)
 234 {
 235         set_native_irq_info(irq, mask);
 236 }
 237
 238 #endif /* CONFIG_PCI_MSI */
 239
 240 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
 241
 242 static inline void move_irq(int irq)
 243 {
 244 }
 245
 246 static inline void move_native_irq(int irq)
 247 {
 248 }
 249
 250 static inline void move_masked_irq(int irq)
 251 {
 252 }
 253
 254 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
 255 {
 256 }
 257
 258 static inline void set_irq_info(int irq, cpumask_t mask)
 259 {
 260         set_native_irq_info(irq, mask);
 261 }
 262
 263 #endif /* CONFIG_GENERIC_PENDING_IRQ */
 264
 265 #else /* CONFIG_SMP */
 266
 267 #define move_irq(x)
 268 #define move_native_irq(x)
 269 #define move_masked_irq(x)
 270
 271 #endif /* CONFIG_SMP */
 272
 273 #ifdef CONFIG_IRQBALANCE
 274 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
 275 #else
 276 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
 277 {
 278 }
 279 #endif
 280
 281 #ifdef CONFIG_AUTO_IRQ_AFFINITY
 282 extern int select_smp_affinity(unsigned int irq);
 283 #else
 284 static inline int select_smp_affinity(unsigned int irq)
 285 {
 286         return 1;
 287 }
 288 #endif
 289
 290 extern int no_irq_affinity;
 291
 292 /* Handle irq action chains: */
 293 extern int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
 294                             struct irqaction *action);
 295
 296 /*
 297  * Built-in IRQ handlers for various IRQ types,
 298  * callable via desc->chip->handle_irq()
 299  */
 300 extern void fastcall
 301 handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
 302 extern void fastcall
 303 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc,
 304                          struct pt_regs *regs);
 305 extern void fastcall
 306 handle_edge_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
 307 extern void fastcall
 308 handle_simple_irq(unsigned int irq, struct irq_desc *desc,
 309                   struct pt_regs *regs);
 310 extern void fastcall
 311 handle_percpu_irq(unsigned int irq, struct irq_desc *desc,
 312                   struct pt_regs *regs);
 313 extern void fastcall
 314 handle_bad_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
 315
 316 /*
 317  * Get a descriptive string for the highlevel handler, for
 318  * /proc/interrupts output:
 319  */
 320 extern const char *
 321 handle_irq_name(void fastcall (*handle)(unsigned int, struct irq_desc *,
 322                                         struct pt_regs *));
 323
 324 /*
 325  * Monolithic do_IRQ implementation.
 326  * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
 327  */
 328 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 329 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
 330 #endif
 331
 332 /*
 333  * Architectures call this to let the generic IRQ layer
 334  * handle an interrupt. If the descriptor is attached to an
 335  * irqchip-style controller then we call the ->handle_irq() handler,
 336  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 337  */
 338 static inline void generic_handle_irq(unsigned int irq, struct pt_regs *regs)
 339 {
 340         struct irq_desc *desc = irq_desc + irq;
 341
 342 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 343         desc->handle_irq(irq, desc, regs);
 344 #else
 345         if (likely(desc->handle_irq))
 346                 desc->handle_irq(irq, desc, regs);
 347         else
 348                 __do_IRQ(irq, regs);
 349 #endif
 350 }
 351
 352 /* Handling of unhandled and spurious interrupts: */
 353 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 354                            int action_ret, struct pt_regs *regs);
 355
 356 /* Resending of interrupts :*/
 357 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
 358
 359 /* Initialize /proc/irq/ */
 360 extern void init_irq_proc(void);
 361
 362 /* Enable/disable irq debugging output: */
 363 extern int noirqdebug_setup(char *str);
 364
 365 /* Checks whether the interrupt can be requested by request_irq(): */
 366 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 367
 368 /* Dummy irq-chip implementations: */
 369 extern struct irq_chip no_irq_chip;
 370 extern struct irq_chip dummy_irq_chip;
 371
 372 extern void
 373 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 374                          void fastcall (*handle)(unsigned int,
 375                                                  struct irq_desc *,
 376                                                  struct pt_regs *));
 377 extern void
 378 __set_irq_handler(unsigned int irq,
 379                   void fastcall (*handle)(unsigned int, struct irq_desc *,
 380                                           struct pt_regs *),
 381                   int is_chained);
 382
 383 /*
 384  * Set a highlevel flow handler for a given IRQ:
 385  */
 386 static inline void
 387 set_irq_handler(unsigned int irq,
 388                 void fastcall (*handle)(unsigned int, struct irq_desc *,
 389                                         struct pt_regs *))
 390 {
 391         __set_irq_handler(irq, handle, 0);
 392 }
 393
 394 /*
 395  * Set a highlevel chained flow handler for a given IRQ.
 396  * (a chained handler is automatically enabled and set to
 397  *  IRQ_NOREQUEST and IRQ_NOPROBE)
 398  */
 399 static inline void
 400 set_irq_chained_handler(unsigned int irq,
 401                         void fastcall (*handle)(unsigned int, struct irq_desc *,
 402                                                 struct pt_regs *))
 403 {
 404         __set_irq_handler(irq, handle, 1);
 405 }
 406
 407 /* Handle dynamic irq creation and destruction */
 408 extern int create_irq(void);
 409 extern void destroy_irq(unsigned int irq);
 410
 411 /* Dynamic irq helper functions */
 412 extern void dynamic_irq_init(unsigned int irq);
 413 extern void dynamic_irq_cleanup(unsigned int irq);
 414
 415 /* Set/get chip/data for an IRQ: */
 416 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
 417 extern int set_irq_data(unsigned int irq, void *data);
 418 extern int set_irq_chip_data(unsigned int irq, void *data);
 419 extern int set_irq_type(unsigned int irq, unsigned int type);
 420
 421 #define get_irq_chip(irq)       (irq_desc[irq].chip)
 422 #define get_irq_chip_data(irq)  (irq_desc[irq].chip_data)
 423 #define get_irq_data(irq)       (irq_desc[irq].handler_data)
 424
 425 #endif /* CONFIG_GENERIC_HARDIRQS */
 426
 427 #endif /* !CONFIG_S390 */
 428
 429 #endif /* _LINUX_IRQ_H */