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
  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         unsigned int            *kstat_irqs;
 178 #ifdef CONFIG_INTR_REMAP
 179         struct irq_2_iommu      *irq_2_iommu;
 180 #endif
 181         irq_flow_handler_t      handle_irq;
 182         struct irq_chip         *chip;
 183         struct msi_desc         *msi_desc;
 184         void                    *handler_data;
 185         void                    *chip_data;
 186         struct irqaction        *action;        /* IRQ action list */
 187         unsigned int            status;         /* IRQ status */
 188
 189         unsigned int            depth;          /* nested irq disables */
 190         unsigned int            wake_depth;     /* nested wake enables */
 191         unsigned int            irq_count;      /* For detecting broken IRQs */
 192         unsigned long           last_unhandled; /* Aging timer for unhandled count */
 193         unsigned int            irqs_unhandled;
 194         raw_spinlock_t          lock;
 195 #ifdef CONFIG_SMP
 196         cpumask_var_t           affinity;
 197         unsigned int            node;
 198 #ifdef CONFIG_GENERIC_PENDING_IRQ
 199         cpumask_var_t           pending_mask;
 200 #endif
 201 #endif
 202         atomic_t                threads_active;
 203         wait_queue_head_t       wait_for_threads;
 204 #ifdef CONFIG_PROC_FS
 205         struct proc_dir_entry   *dir;
 206 #endif
 207         const char              *name;
 208 } ____cacheline_internodealigned_in_smp;
 209
 210 extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
 211                                         struct irq_desc *desc, int node);
 212 extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
 213
 214 #ifndef CONFIG_SPARSE_IRQ
 215 extern struct irq_desc irq_desc[NR_IRQS];
 216 #endif
 217
 218 #ifdef CONFIG_NUMA_IRQ_DESC
 219 extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
 220 #else
 221 static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
 222 {
 223         return desc;
 224 }
 225 #endif
 226
 227 extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
 228
 229 /*
 230  * Pick up the arch-dependent methods:
 231  */
 232 #include <asm/hw_irq.h>
 233
 234 extern int setup_irq(unsigned int irq, struct irqaction *new);
 235 extern void remove_irq(unsigned int irq, struct irqaction *act);
 236
 237 #ifdef CONFIG_GENERIC_HARDIRQS
 238
 239 #ifdef CONFIG_SMP
 240
 241 #ifdef CONFIG_GENERIC_PENDING_IRQ
 242
 243 void move_native_irq(int irq);
 244 void move_masked_irq(int irq);
 245
 246 #else /* CONFIG_GENERIC_PENDING_IRQ */
 247
 248 static inline void move_irq(int irq)
 249 {
 250 }
 251
 252 static inline void move_native_irq(int irq)
 253 {
 254 }
 255
 256 static inline void move_masked_irq(int irq)
 257 {
 258 }
 259
 260 #endif /* CONFIG_GENERIC_PENDING_IRQ */
 261
 262 #else /* CONFIG_SMP */
 263
 264 #define move_native_irq(x)
 265 #define move_masked_irq(x)
 266
 267 #endif /* CONFIG_SMP */
 268
 269 extern int no_irq_affinity;
 270
 271 static inline int irq_balancing_disabled(unsigned int irq)
 272 {
 273         struct irq_desc *desc;
 274
 275         desc = irq_to_desc(irq);
 276         return desc->status & IRQ_NO_BALANCING_MASK;
 277 }
 278
 279 /* Handle irq action chains: */
 280 extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
 281
 282 /*
 283  * Built-in IRQ handlers for various IRQ types,
 284  * callable via desc->handle_irq()
 285  */
 286 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
 287 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
 288 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
 289 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
 290 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
 291 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
 292 extern void handle_nested_irq(unsigned int irq);
 293
 294 /*
 295  * Monolithic do_IRQ implementation.
 296  */
 297 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 298 extern unsigned int __do_IRQ(unsigned int irq);
 299 #endif
 300
 301 /*
 302  * Architectures call this to let the generic IRQ layer
 303  * handle an interrupt. If the descriptor is attached to an
 304  * irqchip-style controller then we call the ->handle_irq() handler,
 305  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 306  */
 307 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 308 {
 309 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 310         desc->handle_irq(irq, desc);
 311 #else
 312         if (likely(desc->handle_irq))
 313                 desc->handle_irq(irq, desc);
 314         else
 315                 __do_IRQ(irq);
 316 #endif
 317 }
 318
 319 static inline void generic_handle_irq(unsigned int irq)
 320 {
 321         generic_handle_irq_desc(irq, irq_to_desc(irq));
 322 }
 323
 324 /* Handling of unhandled and spurious interrupts: */
 325 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 326                            irqreturn_t action_ret);
 327
 328 /* Resending of interrupts :*/
 329 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
 330
 331 /* Enable/disable irq debugging output: */
 332 extern int noirqdebug_setup(char *str);
 333
 334 /* Checks whether the interrupt can be requested by request_irq(): */
 335 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 336
 337 /* Dummy irq-chip implementations: */
 338 extern struct irq_chip no_irq_chip;
 339 extern struct irq_chip dummy_irq_chip;
 340
 341 extern void
 342 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 343                          irq_flow_handler_t handle);
 344 extern void
 345 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 346                               irq_flow_handler_t handle, const char *name);
 347
 348 extern void
 349 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 350                   const char *name);
 351
 352 /* caller has locked the irq_desc and both params are valid */
 353 static inline void __set_irq_handler_unlocked(int irq,
 354                                               irq_flow_handler_t handler)
 355 {
 356         struct irq_desc *desc;
 357
 358         desc = irq_to_desc(irq);
 359         desc->handle_irq = handler;
 360 }
 361
 362 /*
 363  * Set a highlevel flow handler for a given IRQ:
 364  */
 365 static inline void
 366 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
 367 {
 368         __set_irq_handler(irq, handle, 0, NULL);
 369 }
 370
 371 /*
 372  * Set a highlevel chained flow handler for a given IRQ.
 373  * (a chained handler is automatically enabled and set to
 374  *  IRQ_NOREQUEST and IRQ_NOPROBE)
 375  */
 376 static inline void
 377 set_irq_chained_handler(unsigned int irq,
 378                         irq_flow_handler_t handle)
 379 {
 380         __set_irq_handler(irq, handle, 1, NULL);
 381 }
 382
 383 extern void set_irq_nested_thread(unsigned int irq, int nest);
 384
 385 extern void set_irq_noprobe(unsigned int irq);
 386 extern void set_irq_probe(unsigned int irq);
 387
 388 /* Handle dynamic irq creation and destruction */
 389 extern unsigned int create_irq_nr(unsigned int irq_want, int node);
 390 extern int create_irq(void);
 391 extern void destroy_irq(unsigned int irq);
 392
 393 /* Test to see if a driver has successfully requested an irq */
 394 static inline int irq_has_action(unsigned int irq)
 395 {
 396         struct irq_desc *desc = irq_to_desc(irq);
 397         return desc->action != NULL;
 398 }
 399
 400 /* Dynamic irq helper functions */
 401 extern void dynamic_irq_init(unsigned int irq);
 402 void dynamic_irq_init_keep_chip_data(unsigned int irq);
 403 extern void dynamic_irq_cleanup(unsigned int irq);
 404 void dynamic_irq_cleanup_keep_chip_data(unsigned int irq);
 405
 406 /* Set/get chip/data for an IRQ: */
 407 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
 408 extern int set_irq_data(unsigned int irq, void *data);
 409 extern int set_irq_chip_data(unsigned int irq, void *data);
 410 extern int set_irq_type(unsigned int irq, unsigned int type);
 411 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
 412
 413 #define get_irq_chip(irq)       (irq_to_desc(irq)->chip)
 414 #define get_irq_chip_data(irq)  (irq_to_desc(irq)->chip_data)
 415 #define get_irq_data(irq)       (irq_to_desc(irq)->handler_data)
 416 #define get_irq_msi(irq)        (irq_to_desc(irq)->msi_desc)
 417
 418 #define get_irq_desc_chip(desc)         ((desc)->chip)
 419 #define get_irq_desc_chip_data(desc)    ((desc)->chip_data)
 420 #define get_irq_desc_data(desc)         ((desc)->handler_data)
 421 #define get_irq_desc_msi(desc)          ((desc)->msi_desc)
 422
 423 #endif /* CONFIG_GENERIC_HARDIRQS */
 424
 425 #endif /* !CONFIG_S390 */
 426
 427 #ifdef CONFIG_SMP
 428 /**
 429  * alloc_desc_masks - allocate cpumasks for irq_desc
 430  * @desc:       pointer to irq_desc struct
 431  * @node:       node which will be handling the cpumasks
 432  * @boot:       true if need bootmem
 433  *
 434  * Allocates affinity and pending_mask cpumask if required.
 435  * Returns true if successful (or not required).
 436  */
 437 static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
 438                                                         bool boot)
 439 {
 440         gfp_t gfp = GFP_ATOMIC;
 441
 442         if (boot)
 443                 gfp = GFP_NOWAIT;
 444
 445 #ifdef CONFIG_CPUMASK_OFFSTACK
 446         if (!alloc_cpumask_var_node(&desc->affinity, gfp, node))
 447                 return false;
 448
 449 #ifdef CONFIG_GENERIC_PENDING_IRQ
 450         if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
 451                 free_cpumask_var(desc->affinity);
 452                 return false;
 453         }
 454 #endif
 455 #endif
 456         return true;
 457 }
 458
 459 static inline void init_desc_masks(struct irq_desc *desc)
 460 {
 461         cpumask_setall(desc->affinity);
 462 #ifdef CONFIG_GENERIC_PENDING_IRQ
 463         cpumask_clear(desc->pending_mask);
 464 #endif
 465 }
 466
 467 /**
 468  * init_copy_desc_masks - copy cpumasks for irq_desc
 469  * @old_desc:   pointer to old irq_desc struct
 470  * @new_desc:   pointer to new irq_desc struct
 471  *
 472  * Insures affinity and pending_masks are copied to new irq_desc.
 473  * If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
 474  * irq_desc struct so the copy is redundant.
 475  */
 476
 477 static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 478                                         struct irq_desc *new_desc)
 479 {
 480 #ifdef CONFIG_CPUMASK_OFFSTACK
 481         cpumask_copy(new_desc->affinity, old_desc->affinity);
 482
 483 #ifdef CONFIG_GENERIC_PENDING_IRQ
 484         cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
 485 #endif
 486 #endif
 487 }
 488
 489 static inline void free_desc_masks(struct irq_desc *old_desc,
 490                                    struct irq_desc *new_desc)
 491 {
 492         free_cpumask_var(old_desc->affinity);
 493
 494 #ifdef CONFIG_GENERIC_PENDING_IRQ
 495         free_cpumask_var(old_desc->pending_mask);
 496 #endif
 497 }
 498
 499 #else /* !CONFIG_SMP */
 500
 501 static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
 502                                                                 bool boot)
 503 {
 504         return true;
 505 }
 506
 507 static inline void init_desc_masks(struct irq_desc *desc)
 508 {
 509 }
 510
 511 static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 512                                         struct irq_desc *new_desc)
 513 {
 514 }
 515
 516 static inline void free_desc_masks(struct irq_desc *old_desc,
 517                                    struct irq_desc *new_desc)
 518 {
 519 }
 520 #endif  /* CONFIG_SMP */
 521
 522 #endif /* _LINUX_IRQ_H */