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
  73 #ifdef CONFIG_IRQ_PER_CPU
  74 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
  75 # define IRQ_NO_BALANCING_MASK  (IRQ_PER_CPU | IRQ_NO_BALANCING)
  76 #else
  77 # define CHECK_IRQ_PER_CPU(var) 0
  78 # define IRQ_NO_BALANCING_MASK  IRQ_NO_BALANCING
  79 #endif
  80
  81 struct proc_dir_entry;
  82 struct msi_desc;
  83
  84 /**
  85  * struct irq_chip - hardware interrupt chip descriptor
  86  *
  87  * @name:               name for /proc/interrupts
  88  * @startup:            start up the interrupt (defaults to ->enable if NULL)
  89  * @shutdown:           shut down the interrupt (defaults to ->disable if NULL)
  90  * @enable:             enable the interrupt (defaults to chip->unmask if NULL)
  91  * @disable:            disable the interrupt (defaults to chip->mask if NULL)
  92  * @ack:                start of a new interrupt
  93  * @mask:               mask an interrupt source
  94  * @mask_ack:           ack and mask an interrupt source
  95  * @unmask:             unmask an interrupt source
  96  * @eoi:                end of interrupt - chip level
  97  * @end:                end of interrupt - flow level
  98  * @set_affinity:       set the CPU affinity on SMP machines
  99  * @retrigger:          resend an IRQ to the CPU
 100  * @set_type:           set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
 101  * @set_wake:           enable/disable power-management wake-on of an IRQ
 102  *
 103  * @release:            release function solely used by UML
 104  * @typename:           obsoleted by name, kept as migration helper
 105  */
 106 struct irq_chip {
 107         const char      *name;
 108         unsigned int    (*startup)(unsigned int irq);
 109         void            (*shutdown)(unsigned int irq);
 110         void            (*enable)(unsigned int irq);
 111         void            (*disable)(unsigned int irq);
 112
 113         void            (*ack)(unsigned int irq);
 114         void            (*mask)(unsigned int irq);
 115         void            (*mask_ack)(unsigned int irq);
 116         void            (*unmask)(unsigned int irq);
 117         void            (*eoi)(unsigned int irq);
 118
 119         void            (*end)(unsigned int irq);
 120         int             (*set_affinity)(unsigned int irq,
 121                                         const struct cpumask *dest);
 122         int             (*retrigger)(unsigned int irq);
 123         int             (*set_type)(unsigned int irq, unsigned int flow_type);
 124         int             (*set_wake)(unsigned int irq, unsigned int on);
 125
 126         /* Currently used only by UML, might disappear one day.*/
 127 #ifdef CONFIG_IRQ_RELEASE_METHOD
 128         void            (*release)(unsigned int irq, void *dev_id);
 129 #endif
 130         /*
 131          * For compatibility, ->typename is copied into ->name.
 132          * Will disappear.
 133          */
 134         const char      *typename;
 135 };
 136
 137 struct timer_rand_state;
 138 struct irq_2_iommu;
 139 /**
 140  * struct irq_desc - interrupt descriptor
 141  * @irq:                interrupt number for this descriptor
 142  * @timer_rand_state:   pointer to timer rand state struct
 143  * @kstat_irqs:         irq stats per cpu
 144  * @irq_2_iommu:        iommu with this irq
 145  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
 146  * @chip:               low level interrupt hardware access
 147  * @msi_desc:           MSI descriptor
 148  * @handler_data:       per-IRQ data for the irq_chip methods
 149  * @chip_data:          platform-specific per-chip private data for the chip
 150  *                      methods, to allow shared chip implementations
 151  * @action:             the irq action chain
 152  * @status:             status information
 153  * @depth:              disable-depth, for nested irq_disable() calls
 154  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
 155  * @irq_count:          stats field to detect stalled irqs
 156  * @last_unhandled:     aging timer for unhandled count
 157  * @irqs_unhandled:     stats field for spurious unhandled interrupts
 158  * @lock:               locking for SMP
 159  * @affinity:           IRQ affinity on SMP
 160  * @cpu:                cpu index useful for balancing
 161  * @pending_mask:       pending rebalanced interrupts
 162  * @threads_active:     number of irqaction threads currently running
 163  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
 164  * @dir:                /proc/irq/ procfs entry
 165  * @name:               flow handler name for /proc/interrupts output
 166  */
 167 struct irq_desc {
 168         unsigned int            irq;
 169         struct timer_rand_state *timer_rand_state;
 170         unsigned int            *kstat_irqs;
 171 #ifdef CONFIG_INTR_REMAP
 172         struct irq_2_iommu      *irq_2_iommu;
 173 #endif
 174         irq_flow_handler_t      handle_irq;
 175         struct irq_chip         *chip;
 176         struct msi_desc         *msi_desc;
 177         void                    *handler_data;
 178         void                    *chip_data;
 179         struct irqaction        *action;        /* IRQ action list */
 180         unsigned int            status;         /* IRQ status */
 181
 182         unsigned int            depth;          /* nested irq disables */
 183         unsigned int            wake_depth;     /* nested wake enables */
 184         unsigned int            irq_count;      /* For detecting broken IRQs */
 185         unsigned long           last_unhandled; /* Aging timer for unhandled count */
 186         unsigned int            irqs_unhandled;
 187         spinlock_t              lock;
 188 #ifdef CONFIG_SMP
 189         cpumask_var_t           affinity;
 190         unsigned int            node;
 191 #ifdef CONFIG_GENERIC_PENDING_IRQ
 192         cpumask_var_t           pending_mask;
 193 #endif
 194 #endif
 195         atomic_t                threads_active;
 196         wait_queue_head_t       wait_for_threads;
 197 #ifdef CONFIG_PROC_FS
 198         struct proc_dir_entry   *dir;
 199 #endif
 200         const char              *name;
 201 } ____cacheline_internodealigned_in_smp;
 202
 203 extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
 204                                         struct irq_desc *desc, int node);
 205 extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
 206
 207 #ifndef CONFIG_SPARSE_IRQ
 208 extern struct irq_desc irq_desc[NR_IRQS];
 209 #endif
 210
 211 #ifdef CONFIG_NUMA_IRQ_DESC
 212 extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
 213 #else
 214 static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
 215 {
 216         return desc;
 217 }
 218 #endif
 219
 220 extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
 221
 222 /*
 223  * Migration helpers for obsolete names, they will go away:
 224  */
 225 #define hw_interrupt_type       irq_chip
 226 #define no_irq_type             no_irq_chip
 227 typedef struct irq_desc         irq_desc_t;
 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->chip->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
 293 /*
 294  * Monolithic do_IRQ implementation.
 295  */
 296 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 297 extern unsigned int __do_IRQ(unsigned int irq);
 298 #endif
 299
 300 /*
 301  * Architectures call this to let the generic IRQ layer
 302  * handle an interrupt. If the descriptor is attached to an
 303  * irqchip-style controller then we call the ->handle_irq() handler,
 304  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 305  */
 306 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 307 {
 308 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 309         desc->handle_irq(irq, desc);
 310 #else
 311         if (likely(desc->handle_irq))
 312                 desc->handle_irq(irq, desc);
 313         else
 314                 __do_IRQ(irq);
 315 #endif
 316 }
 317
 318 static inline void generic_handle_irq(unsigned int irq)
 319 {
 320         generic_handle_irq_desc(irq, irq_to_desc(irq));
 321 }
 322
 323 /* Handling of unhandled and spurious interrupts: */
 324 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 325                            irqreturn_t action_ret);
 326
 327 /* Resending of interrupts :*/
 328 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
 329
 330 /* Enable/disable irq debugging output: */
 331 extern int noirqdebug_setup(char *str);
 332
 333 /* Checks whether the interrupt can be requested by request_irq(): */
 334 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 335
 336 /* Dummy irq-chip implementations: */
 337 extern struct irq_chip no_irq_chip;
 338 extern struct irq_chip dummy_irq_chip;
 339
 340 extern void
 341 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 342                          irq_flow_handler_t handle);
 343 extern void
 344 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 345                               irq_flow_handler_t handle, const char *name);
 346
 347 extern void
 348 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 349                   const char *name);
 350
 351 /* caller has locked the irq_desc and both params are valid */
 352 static inline void __set_irq_handler_unlocked(int irq,
 353                                               irq_flow_handler_t handler)
 354 {
 355         struct irq_desc *desc;
 356
 357         desc = irq_to_desc(irq);
 358         desc->handle_irq = handler;
 359 }
 360
 361 /*
 362  * Set a highlevel flow handler for a given IRQ:
 363  */
 364 static inline void
 365 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
 366 {
 367         __set_irq_handler(irq, handle, 0, NULL);
 368 }
 369
 370 /*
 371  * Set a highlevel chained flow handler for a given IRQ.
 372  * (a chained handler is automatically enabled and set to
 373  *  IRQ_NOREQUEST and IRQ_NOPROBE)
 374  */
 375 static inline void
 376 set_irq_chained_handler(unsigned int irq,
 377                         irq_flow_handler_t handle)
 378 {
 379         __set_irq_handler(irq, handle, 1, NULL);
 380 }
 381
 382 extern void set_irq_noprobe(unsigned int irq);
 383 extern void set_irq_probe(unsigned int irq);
 384
 385 /* Handle dynamic irq creation and destruction */
 386 extern unsigned int create_irq_nr(unsigned int irq_want, int node);
 387 extern int create_irq(void);
 388 extern void destroy_irq(unsigned int irq);
 389
 390 /* Test to see if a driver has successfully requested an irq */
 391 static inline int irq_has_action(unsigned int irq)
 392 {
 393         struct irq_desc *desc = irq_to_desc(irq);
 394         return desc->action != NULL;
 395 }
 396
 397 /* Dynamic irq helper functions */
 398 extern void dynamic_irq_init(unsigned int irq);
 399 extern void dynamic_irq_cleanup(unsigned int irq);
 400
 401 /* Set/get chip/data for an IRQ: */
 402 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
 403 extern int set_irq_data(unsigned int irq, void *data);
 404 extern int set_irq_chip_data(unsigned int irq, void *data);
 405 extern int set_irq_type(unsigned int irq, unsigned int type);
 406 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
 407
 408 #define get_irq_chip(irq)       (irq_to_desc(irq)->chip)
 409 #define get_irq_chip_data(irq)  (irq_to_desc(irq)->chip_data)
 410 #define get_irq_data(irq)       (irq_to_desc(irq)->handler_data)
 411 #define get_irq_msi(irq)        (irq_to_desc(irq)->msi_desc)
 412
 413 #define get_irq_desc_chip(desc)         ((desc)->chip)
 414 #define get_irq_desc_chip_data(desc)    ((desc)->chip_data)
 415 #define get_irq_desc_data(desc)         ((desc)->handler_data)
 416 #define get_irq_desc_msi(desc)          ((desc)->msi_desc)
 417
 418 #endif /* CONFIG_GENERIC_HARDIRQS */
 419
 420 #endif /* !CONFIG_S390 */
 421
 422 #ifdef CONFIG_SMP
 423 /**
 424  * alloc_desc_masks - allocate cpumasks for irq_desc
 425  * @desc:       pointer to irq_desc struct
 426  * @cpu:        cpu which will be handling the cpumasks
 427  * @boot:       true if need bootmem
 428  *
 429  * Allocates affinity and pending_mask cpumask if required.
 430  * Returns true if successful (or not required).
 431  */
 432 static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
 433                                                         bool boot)
 434 {
 435         gfp_t gfp = GFP_ATOMIC;
 436
 437         if (boot)
 438                 gfp = GFP_NOWAIT;
 439
 440 #ifdef CONFIG_CPUMASK_OFFSTACK
 441         if (!alloc_cpumask_var_node(&desc->affinity, gfp, node))
 442                 return false;
 443
 444 #ifdef CONFIG_GENERIC_PENDING_IRQ
 445         if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
 446                 free_cpumask_var(desc->affinity);
 447                 return false;
 448         }
 449 #endif
 450 #endif
 451         return true;
 452 }
 453
 454 static inline void init_desc_masks(struct irq_desc *desc)
 455 {
 456         cpumask_setall(desc->affinity);
 457 #ifdef CONFIG_GENERIC_PENDING_IRQ
 458         cpumask_clear(desc->pending_mask);
 459 #endif
 460 }
 461
 462 /**
 463  * init_copy_desc_masks - copy cpumasks for irq_desc
 464  * @old_desc:   pointer to old irq_desc struct
 465  * @new_desc:   pointer to new irq_desc struct
 466  *
 467  * Insures affinity and pending_masks are copied to new irq_desc.
 468  * If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
 469  * irq_desc struct so the copy is redundant.
 470  */
 471
 472 static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 473                                         struct irq_desc *new_desc)
 474 {
 475 #ifdef CONFIG_CPUMASK_OFFSTACK
 476         cpumask_copy(new_desc->affinity, old_desc->affinity);
 477
 478 #ifdef CONFIG_GENERIC_PENDING_IRQ
 479         cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
 480 #endif
 481 #endif
 482 }
 483
 484 static inline void free_desc_masks(struct irq_desc *old_desc,
 485                                    struct irq_desc *new_desc)
 486 {
 487         free_cpumask_var(old_desc->affinity);
 488
 489 #ifdef CONFIG_GENERIC_PENDING_IRQ
 490         free_cpumask_var(old_desc->pending_mask);
 491 #endif
 492 }
 493
 494 #else /* !CONFIG_SMP */
 495
 496 static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
 497                                                                 bool boot)
 498 {
 499         return true;
 500 }
 501
 502 static inline void init_desc_masks(struct irq_desc *desc)
 503 {
 504 }
 505
 506 static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 507                                         struct irq_desc *new_desc)
 508 {
 509 }
 510
 511 static inline void free_desc_masks(struct irq_desc *old_desc,
 512                                    struct irq_desc *new_desc)
 513 {
 514 }
 515 #endif  /* CONFIG_SMP */
 516
 517 #endif /* _LINUX_IRQ_H */