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/gfp.h>
  21 #include <linux/irqreturn.h>
  22 #include <linux/irqnr.h>
  23 #include <linux/errno.h>
  24 #include <linux/topology.h>
  25 #include <linux/wait.h>
  26
  27 #include <asm/irq.h>
  28 #include <asm/ptrace.h>
  29 #include <asm/irq_regs.h>
  30
  31 struct irq_desc;
  32 typedef void (*irq_flow_handler_t)(unsigned int irq,
  33                                             struct irq_desc *desc);
  34
  35
  36 /*
  37  * IRQ line status.
  38  *
  39  * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
  40  *
  41  * IRQ types
  42  */
  43 #define IRQ_TYPE_NONE           0x00000000      /* Default, unspecified type */
  44 #define IRQ_TYPE_EDGE_RISING    0x00000001      /* Edge rising type */
  45 #define IRQ_TYPE_EDGE_FALLING   0x00000002      /* Edge falling type */
  46 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
  47 #define IRQ_TYPE_LEVEL_HIGH     0x00000004      /* Level high type */
  48 #define IRQ_TYPE_LEVEL_LOW      0x00000008      /* Level low type */
  49 #define IRQ_TYPE_SENSE_MASK     0x0000000f      /* Mask of the above */
  50 #define IRQ_TYPE_PROBE          0x00000010      /* Probing in progress */
  51
  52 /* Internal flags */
  53 #define IRQ_INPROGRESS          0x00000100      /* IRQ handler active - do not enter! */
  54 #define IRQ_DISABLED            0x00000200      /* IRQ disabled - do not enter! */
  55 #define IRQ_PENDING             0x00000400      /* IRQ pending - replay on enable */
  56 #define IRQ_REPLAY              0x00000800      /* IRQ has been replayed but not acked yet */
  57 #define IRQ_AUTODETECT          0x00001000      /* IRQ is being autodetected */
  58 #define IRQ_WAITING             0x00002000      /* IRQ not yet seen - for autodetection */
  59 #define IRQ_LEVEL               0x00004000      /* IRQ level triggered */
  60 #define IRQ_MASKED              0x00008000      /* IRQ masked - shouldn't be seen again */
  61 #define IRQ_PER_CPU             0x00010000      /* IRQ is per CPU */
  62 #define IRQ_NOPROBE             0x00020000      /* IRQ is not valid for probing */
  63 #define IRQ_NOREQUEST           0x00040000      /* IRQ cannot be requested */
  64 #define IRQ_NOAUTOEN            0x00080000      /* IRQ will not be enabled on request irq */
  65 #define IRQ_WAKEUP              0x00100000      /* IRQ triggers system wakeup */
  66 #define IRQ_MOVE_PENDING        0x00200000      /* need to re-target IRQ destination */
  67 #define IRQ_NO_BALANCING        0x00400000      /* IRQ is excluded from balancing */
  68 #define IRQ_SPURIOUS_DISABLED   0x00800000      /* IRQ was disabled by the spurious trap */
  69 #define IRQ_MOVE_PCNTXT         0x01000000      /* IRQ migration from process context */
  70 #define IRQ_AFFINITY_SET        0x02000000      /* IRQ affinity was set from userspace*/
  71 #define IRQ_SUSPENDED           0x04000000      /* IRQ has gone through suspend sequence */
  72 #define IRQ_ONESHOT             0x08000000      /* IRQ is not unmasked after hardirq */
  73 #define IRQ_NESTED_THREAD       0x10000000      /* IRQ is nested into another, no own handler thread */
  74
  75 #ifdef CONFIG_IRQ_PER_CPU
  76 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
  77 # define IRQ_NO_BALANCING_MASK  (IRQ_PER_CPU | IRQ_NO_BALANCING)
  78 #else
  79 # define CHECK_IRQ_PER_CPU(var) 0
  80 # define IRQ_NO_BALANCING_MASK  IRQ_NO_BALANCING
  81 #endif
  82
  83 struct proc_dir_entry;
  84 struct msi_desc;
  85
  86 /**
  87  * struct irq_chip - hardware interrupt chip descriptor
  88  *
  89  * @name:               name for /proc/interrupts
  90  * @startup:            start up the interrupt (defaults to ->enable if NULL)
  91  * @shutdown:           shut down the interrupt (defaults to ->disable if NULL)
  92  * @enable:             enable the interrupt (defaults to chip->unmask if NULL)
  93  * @disable:            disable the interrupt (defaults to chip->mask if NULL)
  94  * @ack:                start of a new interrupt
  95  * @mask:               mask an interrupt source
  96  * @mask_ack:           ack and mask an interrupt source
  97  * @unmask:             unmask an interrupt source
  98  * @eoi:                end of interrupt - chip level
  99  * @end:                end of interrupt - flow level
 100  * @set_affinity:       set the CPU affinity on SMP machines
 101  * @retrigger:          resend an IRQ to the CPU
 102  * @set_type:           set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
 103  * @set_wake:           enable/disable power-management wake-on of an IRQ
 104  *
 105  * @bus_lock:           function to lock access to slow bus (i2c) chips
 106  * @bus_sync_unlock:    function to sync and unlock slow bus (i2c) chips
 107  *
 108  * @release:            release function solely used by UML
 109  * @typename:           obsoleted by name, kept as migration helper
 110  */
 111 struct irq_chip {
 112         const char      *name;
 113         unsigned int    (*startup)(unsigned int irq);
 114         void            (*shutdown)(unsigned int irq);
 115         void            (*enable)(unsigned int irq);
 116         void            (*disable)(unsigned int irq);
 117
 118         void            (*ack)(unsigned int irq);
 119         void            (*mask)(unsigned int irq);
 120         void            (*mask_ack)(unsigned int irq);
 121         void            (*unmask)(unsigned int irq);
 122         void            (*eoi)(unsigned int irq);
 123
 124         void            (*end)(unsigned int irq);
 125         int             (*set_affinity)(unsigned int irq,
 126                                         const struct cpumask *dest);
 127         int             (*retrigger)(unsigned int irq);
 128         int             (*set_type)(unsigned int irq, unsigned int flow_type);
 129         int             (*set_wake)(unsigned int irq, unsigned int on);
 130
 131         void            (*bus_lock)(unsigned int irq);
 132         void            (*bus_sync_unlock)(unsigned int irq);
 133
 134         /* Currently used only by UML, might disappear one day.*/
 135 #ifdef CONFIG_IRQ_RELEASE_METHOD
 136         void            (*release)(unsigned int irq, void *dev_id);
 137 #endif
 138         /*
 139          * For compatibility, ->typename is copied into ->name.
 140          * Will disappear.
 141          */
 142         const char      *typename;
 143 };
 144
 145 struct timer_rand_state;
 146 struct irq_2_iommu;
 147 /**
 148  * struct irq_desc - interrupt descriptor
 149  * @irq:                interrupt number for this descriptor
 150  * @timer_rand_state:   pointer to timer rand state struct
 151  * @kstat_irqs:         irq stats per cpu
 152  * @irq_2_iommu:        iommu with this irq
 153  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
 154  * @chip:               low level interrupt hardware access
 155  * @msi_desc:           MSI descriptor
 156  * @handler_data:       per-IRQ data for the irq_chip methods
 157  * @chip_data:          platform-specific per-chip private data for the chip
 158  *                      methods, to allow shared chip implementations
 159  * @action:             the irq action chain
 160  * @status:             status information
 161  * @depth:              disable-depth, for nested irq_disable() calls
 162  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
 163  * @irq_count:          stats field to detect stalled irqs
 164  * @last_unhandled:     aging timer for unhandled count
 165  * @irqs_unhandled:     stats field for spurious unhandled interrupts
 166  * @lock:               locking for SMP
 167  * @affinity:           IRQ affinity on SMP
 168  * @node:               node index useful for balancing
 169  * @pending_mask:       pending rebalanced interrupts
 170  * @threads_active:     number of irqaction threads currently running
 171  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
 172  * @dir:                /proc/irq/ procfs entry
 173  * @name:               flow handler name for /proc/interrupts output
 174  */
 175 struct irq_desc {
 176         unsigned int            irq;
 177         struct timer_rand_state *timer_rand_state;
 178         unsigned int            *kstat_irqs;
 179 #ifdef CONFIG_INTR_REMAP
 180         struct irq_2_iommu      *irq_2_iommu;
 181 #endif
 182         irq_flow_handler_t      handle_irq;
 183         struct irq_chip         *chip;
 184         struct msi_desc         *msi_desc;
 185         void                    *handler_data;
 186         void                    *chip_data;
 187         struct irqaction        *action;        /* IRQ action list */
 188         unsigned int            status;         /* IRQ status */
 189
 190         unsigned int            depth;          /* nested irq disables */
 191         unsigned int            wake_depth;     /* nested wake enables */
 192         unsigned int            irq_count;      /* For detecting broken IRQs */
 193         unsigned long           last_unhandled; /* Aging timer for unhandled count */
 194         unsigned int            irqs_unhandled;
 195         spinlock_t              lock;
 196 #ifdef CONFIG_SMP
 197         cpumask_var_t           affinity;
 198         unsigned int            node;
 199 #ifdef CONFIG_GENERIC_PENDING_IRQ
 200         cpumask_var_t           pending_mask;
 201 #endif
 202 #endif
 203         atomic_t                threads_active;
 204         wait_queue_head_t       wait_for_threads;
 205 #ifdef CONFIG_PROC_FS
 206         struct proc_dir_entry   *dir;
 207 #endif
 208         const char              *name;
 209 } ____cacheline_internodealigned_in_smp;
 210
 211 extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
 212                                         struct irq_desc *desc, int node);
 213 extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
 214
 215 #ifndef CONFIG_SPARSE_IRQ
 216 extern struct irq_desc irq_desc[NR_IRQS];
 217 #endif
 218
 219 #ifdef CONFIG_NUMA_IRQ_DESC
 220 extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
 221 #else
 222 static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
 223 {
 224         return desc;
 225 }
 226 #endif
 227
 228 extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
 229
 230 /*
 231  * Pick up the arch-dependent methods:
 232  */
 233 #include <asm/hw_irq.h>
 234
 235 extern int setup_irq(unsigned int irq, struct irqaction *new);
 236 extern void remove_irq(unsigned int irq, struct irqaction *act);
 237
 238 #ifdef CONFIG_GENERIC_HARDIRQS
 239
 240 #ifdef CONFIG_SMP
 241
 242 #ifdef CONFIG_GENERIC_PENDING_IRQ
 243
 244 void move_native_irq(int irq);
 245 void move_masked_irq(int irq);
 246
 247 #else /* CONFIG_GENERIC_PENDING_IRQ */
 248
 249 static inline void move_irq(int irq)
 250 {
 251 }
 252
 253 static inline void move_native_irq(int irq)
 254 {
 255 }
 256
 257 static inline void move_masked_irq(int irq)
 258 {
 259 }
 260
 261 #endif /* CONFIG_GENERIC_PENDING_IRQ */
 262
 263 #else /* CONFIG_SMP */
 264
 265 #define move_native_irq(x)
 266 #define move_masked_irq(x)
 267
 268 #endif /* CONFIG_SMP */
 269
 270 extern int no_irq_affinity;
 271
 272 static inline int irq_balancing_disabled(unsigned int irq)
 273 {
 274         struct irq_desc *desc;
 275
 276         desc = irq_to_desc(irq);
 277         return desc->status & IRQ_NO_BALANCING_MASK;
 278 }
 279
 280 /* Handle irq action chains: */
 281 extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
 282
 283 /*
 284  * Built-in IRQ handlers for various IRQ types,
 285  * callable via desc->chip->handle_irq()
 286  */
 287 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
 288 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
 289 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
 290 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
 291 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
 292 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
 293 extern void handle_nested_irq(unsigned int irq);
 294
 295 /*
 296  * Monolithic do_IRQ implementation.
 297  */
 298 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 299 extern unsigned int __do_IRQ(unsigned int irq);
 300 #endif
 301
 302 /*
 303  * Architectures call this to let the generic IRQ layer
 304  * handle an interrupt. If the descriptor is attached to an
 305  * irqchip-style controller then we call the ->handle_irq() handler,
 306  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 307  */
 308 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 309 {
 310 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 311         desc->handle_irq(irq, desc);
 312 #else
 313         if (likely(desc->handle_irq))
 314                 desc->handle_irq(irq, desc);
 315         else
 316                 __do_IRQ(irq);
 317 #endif
 318 }
 319
 320 static inline void generic_handle_irq(unsigned int irq)
 321 {
 322         generic_handle_irq_desc(irq, irq_to_desc(irq));
 323 }
 324
 325 /* Handling of unhandled and spurious interrupts: */
 326 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 327                            irqreturn_t action_ret);
 328
 329 /* Resending of interrupts :*/
 330 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
 331
 332 /* Enable/disable irq debugging output: */
 333 extern int noirqdebug_setup(char *str);
 334
 335 /* Checks whether the interrupt can be requested by request_irq(): */
 336 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 337
 338 /* Dummy irq-chip implementations: */
 339 extern struct irq_chip no_irq_chip;
 340 extern struct irq_chip dummy_irq_chip;
 341
 342 extern void
 343 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 344                          irq_flow_handler_t handle);
 345 extern void
 346 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 347                               irq_flow_handler_t handle, const char *name);
 348
 349 extern void
 350 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 351                   const char *name);
 352
 353 /* caller has locked the irq_desc and both params are valid */
 354 static inline void __set_irq_handler_unlocked(int irq,
 355                                               irq_flow_handler_t handler)
 356 {
 357         struct irq_desc *desc;
 358
 359         desc = irq_to_desc(irq);
 360         desc->handle_irq = handler;
 361 }
 362
 363 /*
 364  * Set a highlevel flow handler for a given IRQ:
 365  */
 366 static inline void
 367 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
 368 {
 369         __set_irq_handler(irq, handle, 0, NULL);
 370 }
 371
 372 /*
 373  * Set a highlevel chained flow handler for a given IRQ.
 374  * (a chained handler is automatically enabled and set to
 375  *  IRQ_NOREQUEST and IRQ_NOPROBE)
 376  */
 377 static inline void
 378 set_irq_chained_handler(unsigned int irq,
 379                         irq_flow_handler_t handle)
 380 {
 381         __set_irq_handler(irq, handle, 1, NULL);
 382 }
 383
 384 extern void set_irq_nested_thread(unsigned int irq, int nest);
 385
 386 extern void set_irq_noprobe(unsigned int irq);
 387 extern void set_irq_probe(unsigned int irq);
 388
 389 /* Handle dynamic irq creation and destruction */
 390 extern unsigned int create_irq_nr(unsigned int irq_want, int node);
 391 extern int create_irq(void);
 392 extern void destroy_irq(unsigned int irq);
 393
 394 /* Test to see if a driver has successfully requested an irq */
 395 static inline int irq_has_action(unsigned int irq)
 396 {
 397         struct irq_desc *desc = irq_to_desc(irq);
 398         return desc->action != NULL;
 399 }
 400
 401 /* Dynamic irq helper functions */
 402 extern void dynamic_irq_init(unsigned int irq);
 403 extern void dynamic_irq_cleanup(unsigned int irq);
 404
 405 /* Set/get chip/data for an IRQ: */
 406 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
 407 extern int set_irq_data(unsigned int irq, void *data);
 408 extern int set_irq_chip_data(unsigned int irq, void *data);
 409 extern int set_irq_type(unsigned int irq, unsigned int type);
 410 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
 411
 412 #define get_irq_chip(irq)       (irq_to_desc(irq)->chip)
 413 #define get_irq_chip_data(irq)  (irq_to_desc(irq)->chip_data)
 414 #define get_irq_data(irq)       (irq_to_desc(irq)->handler_data)
 415 #define get_irq_msi(irq)        (irq_to_desc(irq)->msi_desc)
 416
 417 #define get_irq_desc_chip(desc)         ((desc)->chip)
 418 #define get_irq_desc_chip_data(desc)    ((desc)->chip_data)
 419 #define get_irq_desc_data(desc)         ((desc)->handler_data)
 420 #define get_irq_desc_msi(desc)          ((desc)->msi_desc)
 421
 422 #endif /* CONFIG_GENERIC_HARDIRQS */
 423
 424 #endif /* !CONFIG_S390 */
 425
 426 #ifdef CONFIG_SMP
 427 /**
 428  * alloc_desc_masks - allocate cpumasks for irq_desc
 429  * @desc:       pointer to irq_desc struct
 430  * @node:       node which will be handling the cpumasks
 431  * @boot:       true if need bootmem
 432  *
 433  * Allocates affinity and pending_mask cpumask if required.
 434  * Returns true if successful (or not required).
 435  */
 436 static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
 437                                                         bool boot)
 438 {
 439         gfp_t gfp = GFP_ATOMIC;
 440
 441         if (boot)
 442                 gfp = GFP_NOWAIT;
 443
 444 #ifdef CONFIG_CPUMASK_OFFSTACK
 445         if (!alloc_cpumask_var_node(&desc->affinity, gfp, node))
 446                 return false;
 447
 448 #ifdef CONFIG_GENERIC_PENDING_IRQ
 449         if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
 450                 free_cpumask_var(desc->affinity);
 451                 return false;
 452         }
 453 #endif
 454 #endif
 455         return true;
 456 }
 457
 458 static inline void init_desc_masks(struct irq_desc *desc)
 459 {
 460         cpumask_setall(desc->affinity);
 461 #ifdef CONFIG_GENERIC_PENDING_IRQ
 462         cpumask_clear(desc->pending_mask);
 463 #endif
 464 }
 465
 466 /**
 467  * init_copy_desc_masks - copy cpumasks for irq_desc
 468  * @old_desc:   pointer to old irq_desc struct
 469  * @new_desc:   pointer to new irq_desc struct
 470  *
 471  * Insures affinity and pending_masks are copied to new irq_desc.
 472  * If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
 473  * irq_desc struct so the copy is redundant.
 474  */
 475
 476 static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 477                                         struct irq_desc *new_desc)
 478 {
 479 #ifdef CONFIG_CPUMASK_OFFSTACK
 480         cpumask_copy(new_desc->affinity, old_desc->affinity);
 481
 482 #ifdef CONFIG_GENERIC_PENDING_IRQ
 483         cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
 484 #endif
 485 #endif
 486 }
 487
 488 static inline void free_desc_masks(struct irq_desc *old_desc,
 489                                    struct irq_desc *new_desc)
 490 {
 491         free_cpumask_var(old_desc->affinity);
 492
 493 #ifdef CONFIG_GENERIC_PENDING_IRQ
 494         free_cpumask_var(old_desc->pending_mask);
 495 #endif
 496 }
 497
 498 #else /* !CONFIG_SMP */
 499
 500 static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
 501                                                                 bool boot)
 502 {
 503         return true;
 504 }
 505
 506 static inline void init_desc_masks(struct irq_desc *desc)
 507 {
 508 }
 509
 510 static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 511                                         struct irq_desc *new_desc)
 512 {
 513 }
 514
 515 static inline void free_desc_masks(struct irq_desc *old_desc,
 516                                    struct irq_desc *new_desc)
 517 {
 518 }
 519 #endif  /* CONFIG_SMP */
 520
 521 #endif /* _LINUX_IRQ_H */