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 seq_file;
  32 struct irq_desc;
  33 struct irq_data;
  34 typedef void (*irq_flow_handler_t)(unsigned int irq,
  35                                             struct irq_desc *desc);
  36 typedef void (*irq_preflow_handler_t)(struct irq_data *data);
  37
  38 /*
  39  * IRQ line status.
  40  *
  41  * Bits 0-7 are the same as the IRQF_* bits in linux/interrupt.h
  42  *
  43  * IRQ_TYPE_NONE                - default, unspecified type
  44  * IRQ_TYPE_EDGE_RISING         - rising edge triggered
  45  * IRQ_TYPE_EDGE_FALLING        - falling edge triggered
  46  * IRQ_TYPE_EDGE_BOTH           - rising and falling edge triggered
  47  * IRQ_TYPE_LEVEL_HIGH          - high level triggered
  48  * IRQ_TYPE_LEVEL_LOW           - low level triggered
  49  * IRQ_TYPE_LEVEL_MASK          - Mask to filter out the level bits
  50  * IRQ_TYPE_SENSE_MASK          - Mask for all the above bits
  51  * IRQ_TYPE_PROBE               - Special flag for probing in progress
  52  *
  53  * Bits which can be modified via irq_set/clear/modify_status_flags()
  54  * IRQ_LEVEL                    - Interrupt is level type. Will be also
  55  *                                updated in the code when the above trigger
  56  *                                bits are modified via set_irq_type()
  57  * IRQ_PER_CPU                  - Mark an interrupt PER_CPU. Will protect
  58  *                                it from affinity setting
  59  * IRQ_NOPROBE                  - Interrupt cannot be probed by autoprobing
  60  * IRQ_NOREQUEST                - Interrupt cannot be requested via
  61  *                                request_irq()
  62  * IRQ_NOAUTOEN                 - Interrupt is not automatically enabled in
  63  *                                request/setup_irq()
  64  * IRQ_NO_BALANCING             - Interrupt cannot be balanced (affinity set)
  65  * IRQ_MOVE_PCNTXT              - Interrupt can be migrated from process context
  66  * IRQ_NESTED_TRHEAD            - Interrupt nests into another thread
  67  *
  68  * Deprecated bits. They are kept updated as long as
  69  * CONFIG_GENERIC_HARDIRQS_NO_COMPAT is not set. Will go away soon. These bits
  70  * are internal state of the core code and if you really need to acces
  71  * them then talk to the genirq maintainer instead of hacking
  72  * something weird.
  73  *
  74  */
  75 enum {
  76         IRQ_TYPE_NONE           = 0x00000000,
  77         IRQ_TYPE_EDGE_RISING    = 0x00000001,
  78         IRQ_TYPE_EDGE_FALLING   = 0x00000002,
  79         IRQ_TYPE_EDGE_BOTH      = (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING),
  80         IRQ_TYPE_LEVEL_HIGH     = 0x00000004,
  81         IRQ_TYPE_LEVEL_LOW      = 0x00000008,
  82         IRQ_TYPE_LEVEL_MASK     = (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH),
  83         IRQ_TYPE_SENSE_MASK     = 0x0000000f,
  84
  85         IRQ_TYPE_PROBE          = 0x00000010,
  86
  87         IRQ_LEVEL               = (1 <<  8),
  88         IRQ_PER_CPU             = (1 <<  9),
  89         IRQ_NOPROBE             = (1 << 10),
  90         IRQ_NOREQUEST           = (1 << 11),
  91         IRQ_NOAUTOEN            = (1 << 12),
  92         IRQ_NO_BALANCING        = (1 << 13),
  93         IRQ_MOVE_PCNTXT         = (1 << 14),
  94         IRQ_NESTED_THREAD       = (1 << 15),
  95 };
  96
  97 #define IRQF_MODIFY_MASK        \
  98         (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
  99          IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
 100          IRQ_PER_CPU | IRQ_NESTED_THREAD)
 101
 102 #define IRQ_NO_BALANCING_MASK   (IRQ_PER_CPU | IRQ_NO_BALANCING)
 103
 104 static inline __deprecated bool CHECK_IRQ_PER_CPU(unsigned int status)
 105 {
 106         return status & IRQ_PER_CPU;
 107 }
 108
 109 /*
 110  * Return value for chip->irq_set_affinity()
 111  *
 112  * IRQ_SET_MASK_OK      - OK, core updates irq_data.affinity
 113  * IRQ_SET_MASK_NOCPY   - OK, chip did update irq_data.affinity
 114  */
 115 enum {
 116         IRQ_SET_MASK_OK = 0,
 117         IRQ_SET_MASK_OK_NOCOPY,
 118 };
 119
 120 struct msi_desc;
 121
 122 /**
 123  * struct irq_data - per irq and irq chip data passed down to chip functions
 124  * @irq:                interrupt number
 125  * @node:               node index useful for balancing
 126  * @state_use_accessors: status information for irq chip functions.
 127  *                      Use accessor functions to deal with it
 128  * @chip:               low level interrupt hardware access
 129  * @handler_data:       per-IRQ data for the irq_chip methods
 130  * @chip_data:          platform-specific per-chip private data for the chip
 131  *                      methods, to allow shared chip implementations
 132  * @msi_desc:           MSI descriptor
 133  * @affinity:           IRQ affinity on SMP
 134  *
 135  * The fields here need to overlay the ones in irq_desc until we
 136  * cleaned up the direct references and switched everything over to
 137  * irq_data.
 138  */
 139 struct irq_data {
 140         unsigned int            irq;
 141         unsigned int            node;
 142         unsigned int            state_use_accessors;
 143         struct irq_chip         *chip;
 144         void                    *handler_data;
 145         void                    *chip_data;
 146         struct msi_desc         *msi_desc;
 147 #ifdef CONFIG_SMP
 148         cpumask_var_t           affinity;
 149 #endif
 150 };
 151
 152 /*
 153  * Bit masks for irq_data.state
 154  *
 155  * IRQD_TRIGGER_MASK            - Mask for the trigger type bits
 156  * IRQD_SETAFFINITY_PENDING     - Affinity setting is pending
 157  * IRQD_NO_BALANCING            - Balancing disabled for this IRQ
 158  * IRQD_PER_CPU                 - Interrupt is per cpu
 159  * IRQD_AFFINITY_SET            - Interrupt affinity was set
 160  * IRQD_LEVEL                   - Interrupt is level triggered
 161  * IRQD_WAKEUP_STATE            - Interrupt is configured for wakeup
 162  *                                from suspend
 163  * IRDQ_MOVE_PCNTXT             - Interrupt can be moved in process
 164  *                                context
 165  * IRQD_IRQ_DISABLED            - Disabled state of the interrupt
 166  * IRQD_IRQ_MASKED              - Masked state of the interrupt
 167  * IRQD_IRQ_INPROGRESS          - In progress state of the interrupt
 168  */
 169 enum {
 170         IRQD_TRIGGER_MASK               = 0xf,
 171         IRQD_SETAFFINITY_PENDING        = (1 <<  8),
 172         IRQD_NO_BALANCING               = (1 << 10),
 173         IRQD_PER_CPU                    = (1 << 11),
 174         IRQD_AFFINITY_SET               = (1 << 12),
 175         IRQD_LEVEL                      = (1 << 13),
 176         IRQD_WAKEUP_STATE               = (1 << 14),
 177         IRQD_MOVE_PCNTXT                = (1 << 15),
 178         IRQD_IRQ_DISABLED               = (1 << 16),
 179         IRQD_IRQ_MASKED                 = (1 << 17),
 180         IRQD_IRQ_INPROGRESS             = (1 << 18),
 181 };
 182
 183 static inline bool irqd_is_setaffinity_pending(struct irq_data *d)
 184 {
 185         return d->state_use_accessors & IRQD_SETAFFINITY_PENDING;
 186 }
 187
 188 static inline bool irqd_is_per_cpu(struct irq_data *d)
 189 {
 190         return d->state_use_accessors & IRQD_PER_CPU;
 191 }
 192
 193 static inline bool irqd_can_balance(struct irq_data *d)
 194 {
 195         return !(d->state_use_accessors & (IRQD_PER_CPU | IRQD_NO_BALANCING));
 196 }
 197
 198 static inline bool irqd_affinity_was_set(struct irq_data *d)
 199 {
 200         return d->state_use_accessors & IRQD_AFFINITY_SET;
 201 }
 202
 203 static inline void irqd_mark_affinity_was_set(struct irq_data *d)
 204 {
 205         d->state_use_accessors |= IRQD_AFFINITY_SET;
 206 }
 207
 208 static inline u32 irqd_get_trigger_type(struct irq_data *d)
 209 {
 210         return d->state_use_accessors & IRQD_TRIGGER_MASK;
 211 }
 212
 213 /*
 214  * Must only be called inside irq_chip.irq_set_type() functions.
 215  */
 216 static inline void irqd_set_trigger_type(struct irq_data *d, u32 type)
 217 {
 218         d->state_use_accessors &= ~IRQD_TRIGGER_MASK;
 219         d->state_use_accessors |= type & IRQD_TRIGGER_MASK;
 220 }
 221
 222 static inline bool irqd_is_level_type(struct irq_data *d)
 223 {
 224         return d->state_use_accessors & IRQD_LEVEL;
 225 }
 226
 227 static inline bool irqd_is_wakeup_set(struct irq_data *d)
 228 {
 229         return d->state_use_accessors & IRQD_WAKEUP_STATE;
 230 }
 231
 232 static inline bool irqd_can_move_in_process_context(struct irq_data *d)
 233 {
 234         return d->state_use_accessors & IRQD_MOVE_PCNTXT;
 235 }
 236
 237 static inline bool irqd_irq_disabled(struct irq_data *d)
 238 {
 239         return d->state_use_accessors & IRQD_IRQ_DISABLED;
 240 }
 241
 242 static inline bool irqd_irq_masked(struct irq_data *d)
 243 {
 244         return d->state_use_accessors & IRQD_IRQ_MASKED;
 245 }
 246
 247 static inline bool irqd_irq_inprogress(struct irq_data *d)
 248 {
 249         return d->state_use_accessors & IRQD_IRQ_INPROGRESS;
 250 }
 251
 252 /*
 253  * Functions for chained handlers which can be enabled/disabled by the
 254  * standard disable_irq/enable_irq calls. Must be called with
 255  * irq_desc->lock held.
 256  */
 257 static inline void irqd_set_chained_irq_inprogress(struct irq_data *d)
 258 {
 259         d->state_use_accessors |= IRQD_IRQ_INPROGRESS;
 260 }
 261
 262 static inline void irqd_clr_chained_irq_inprogress(struct irq_data *d)
 263 {
 264         d->state_use_accessors &= ~IRQD_IRQ_INPROGRESS;
 265 }
 266
 267 /**
 268  * struct irq_chip - hardware interrupt chip descriptor
 269  *
 270  * @name:               name for /proc/interrupts
 271  * @startup:            deprecated, replaced by irq_startup
 272  * @shutdown:           deprecated, replaced by irq_shutdown
 273  * @enable:             deprecated, replaced by irq_enable
 274  * @disable:            deprecated, replaced by irq_disable
 275  * @ack:                deprecated, replaced by irq_ack
 276  * @mask:               deprecated, replaced by irq_mask
 277  * @mask_ack:           deprecated, replaced by irq_mask_ack
 278  * @unmask:             deprecated, replaced by irq_unmask
 279  * @eoi:                deprecated, replaced by irq_eoi
 280  * @end:                deprecated, will go away with __do_IRQ()
 281  * @set_affinity:       deprecated, replaced by irq_set_affinity
 282  * @retrigger:          deprecated, replaced by irq_retrigger
 283  * @set_type:           deprecated, replaced by irq_set_type
 284  * @set_wake:           deprecated, replaced by irq_wake
 285  * @bus_lock:           deprecated, replaced by irq_bus_lock
 286  * @bus_sync_unlock:    deprecated, replaced by irq_bus_sync_unlock
 287  *
 288  * @irq_startup:        start up the interrupt (defaults to ->enable if NULL)
 289  * @irq_shutdown:       shut down the interrupt (defaults to ->disable if NULL)
 290  * @irq_enable:         enable the interrupt (defaults to chip->unmask if NULL)
 291  * @irq_disable:        disable the interrupt
 292  * @irq_ack:            start of a new interrupt
 293  * @irq_mask:           mask an interrupt source
 294  * @irq_mask_ack:       ack and mask an interrupt source
 295  * @irq_unmask:         unmask an interrupt source
 296  * @irq_eoi:            end of interrupt
 297  * @irq_set_affinity:   set the CPU affinity on SMP machines
 298  * @irq_retrigger:      resend an IRQ to the CPU
 299  * @irq_set_type:       set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
 300  * @irq_set_wake:       enable/disable power-management wake-on of an IRQ
 301  * @irq_bus_lock:       function to lock access to slow bus (i2c) chips
 302  * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
 303  * @irq_cpu_online:     configure an interrupt source for a secondary CPU
 304  * @irq_cpu_offline:    un-configure an interrupt source for a secondary CPU
 305  * @irq_print_chip:     optional to print special chip info in show_interrupts
 306  * @flags:              chip specific flags
 307  *
 308  * @release:            release function solely used by UML
 309  */
 310 struct irq_chip {
 311         const char      *name;
 312         unsigned int    (*irq_startup)(struct irq_data *data);
 313         void            (*irq_shutdown)(struct irq_data *data);
 314         void            (*irq_enable)(struct irq_data *data);
 315         void            (*irq_disable)(struct irq_data *data);
 316
 317         void            (*irq_ack)(struct irq_data *data);
 318         void            (*irq_mask)(struct irq_data *data);
 319         void            (*irq_mask_ack)(struct irq_data *data);
 320         void            (*irq_unmask)(struct irq_data *data);
 321         void            (*irq_eoi)(struct irq_data *data);
 322
 323         int             (*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force);
 324         int             (*irq_retrigger)(struct irq_data *data);
 325         int             (*irq_set_type)(struct irq_data *data, unsigned int flow_type);
 326         int             (*irq_set_wake)(struct irq_data *data, unsigned int on);
 327
 328         void            (*irq_bus_lock)(struct irq_data *data);
 329         void            (*irq_bus_sync_unlock)(struct irq_data *data);
 330
 331         void            (*irq_cpu_online)(struct irq_data *data);
 332         void            (*irq_cpu_offline)(struct irq_data *data);
 333
 334         void            (*irq_print_chip)(struct irq_data *data, struct seq_file *p);
 335
 336         unsigned long   flags;
 337
 338         /* Currently used only by UML, might disappear one day.*/
 339 #ifdef CONFIG_IRQ_RELEASE_METHOD
 340         void            (*release)(unsigned int irq, void *dev_id);
 341 #endif
 342 };
 343
 344 /*
 345  * irq_chip specific flags
 346  *
 347  * IRQCHIP_SET_TYPE_MASKED:     Mask before calling chip.irq_set_type()
 348  * IRQCHIP_EOI_IF_HANDLED:      Only issue irq_eoi() when irq was handled
 349  * IRQCHIP_MASK_ON_SUSPEND:     Mask non wake irqs in the suspend path
 350  * IRQCHIP_ONOFFLINE_ENABLED:   Only call irq_on/off_line callbacks
 351  *                              when irq enabled
 352  */
 353 enum {
 354         IRQCHIP_SET_TYPE_MASKED         = (1 <<  0),
 355         IRQCHIP_EOI_IF_HANDLED          = (1 <<  1),
 356         IRQCHIP_MASK_ON_SUSPEND         = (1 <<  2),
 357         IRQCHIP_ONOFFLINE_ENABLED       = (1 <<  3),
 358 };
 359
 360 /* This include will go away once we isolated irq_desc usage to core code */
 361 #include <linux/irqdesc.h>
 362
 363 /*
 364  * Pick up the arch-dependent methods:
 365  */
 366 #include <asm/hw_irq.h>
 367
 368 #ifndef NR_IRQS_LEGACY
 369 # define NR_IRQS_LEGACY 0
 370 #endif
 371
 372 #ifndef ARCH_IRQ_INIT_FLAGS
 373 # define ARCH_IRQ_INIT_FLAGS    0
 374 #endif
 375
 376 #define IRQ_DEFAULT_INIT_FLAGS  ARCH_IRQ_INIT_FLAGS
 377
 378 struct irqaction;
 379 extern int setup_irq(unsigned int irq, struct irqaction *new);
 380 extern void remove_irq(unsigned int irq, struct irqaction *act);
 381
 382 extern void irq_cpu_online(void);
 383 extern void irq_cpu_offline(void);
 384 extern int __irq_set_affinity_locked(struct irq_data *data,  const struct cpumask *cpumask);
 385
 386 #ifdef CONFIG_GENERIC_HARDIRQS
 387
 388 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
 389 void irq_move_irq(struct irq_data *data);
 390 void irq_move_masked_irq(struct irq_data *data);
 391 #else
 392 static inline void irq_move_irq(struct irq_data *data) { }
 393 static inline void irq_move_masked_irq(struct irq_data *data) { }
 394 #endif
 395
 396 extern int no_irq_affinity;
 397
 398 /*
 399  * Built-in IRQ handlers for various IRQ types,
 400  * callable via desc->handle_irq()
 401  */
 402 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
 403 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
 404 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
 405 extern void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc);
 406 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
 407 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
 408 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
 409 extern void handle_nested_irq(unsigned int irq);
 410
 411 /* Handling of unhandled and spurious interrupts: */
 412 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 413                            irqreturn_t action_ret);
 414
 415
 416 /* Enable/disable irq debugging output: */
 417 extern int noirqdebug_setup(char *str);
 418
 419 /* Checks whether the interrupt can be requested by request_irq(): */
 420 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 421
 422 /* Dummy irq-chip implementations: */
 423 extern struct irq_chip no_irq_chip;
 424 extern struct irq_chip dummy_irq_chip;
 425
 426 extern void
 427 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 428                               irq_flow_handler_t handle, const char *name);
 429
 430 static inline void irq_set_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 431                                             irq_flow_handler_t handle)
 432 {
 433         irq_set_chip_and_handler_name(irq, chip, handle, NULL);
 434 }
 435
 436 extern void
 437 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 438                   const char *name);
 439
 440 static inline void
 441 irq_set_handler(unsigned int irq, irq_flow_handler_t handle)
 442 {
 443         __irq_set_handler(irq, handle, 0, NULL);
 444 }
 445
 446 /*
 447  * Set a highlevel chained flow handler for a given IRQ.
 448  * (a chained handler is automatically enabled and set to
 449  *  IRQ_NOREQUEST and IRQ_NOPROBE)
 450  */
 451 static inline void
 452 irq_set_chained_handler(unsigned int irq, irq_flow_handler_t handle)
 453 {
 454         __irq_set_handler(irq, handle, 1, NULL);
 455 }
 456
 457 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);
 458
 459 static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
 460 {
 461         irq_modify_status(irq, 0, set);
 462 }
 463
 464 static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
 465 {
 466         irq_modify_status(irq, clr, 0);
 467 }
 468
 469 static inline void irq_set_noprobe(unsigned int irq)
 470 {
 471         irq_modify_status(irq, 0, IRQ_NOPROBE);
 472 }
 473
 474 static inline void irq_set_probe(unsigned int irq)
 475 {
 476         irq_modify_status(irq, IRQ_NOPROBE, 0);
 477 }
 478
 479 static inline void irq_set_nested_thread(unsigned int irq, bool nest)
 480 {
 481         if (nest)
 482                 irq_set_status_flags(irq, IRQ_NESTED_THREAD);
 483         else
 484                 irq_clear_status_flags(irq, IRQ_NESTED_THREAD);
 485 }
 486
 487 /* Handle dynamic irq creation and destruction */
 488 extern unsigned int create_irq_nr(unsigned int irq_want, int node);
 489 extern int create_irq(void);
 490 extern void destroy_irq(unsigned int irq);
 491
 492 /*
 493  * Dynamic irq helper functions. Obsolete. Use irq_alloc_desc* and
 494  * irq_free_desc instead.
 495  */
 496 extern void dynamic_irq_cleanup(unsigned int irq);
 497 static inline void dynamic_irq_init(unsigned int irq)
 498 {
 499         dynamic_irq_cleanup(irq);
 500 }
 501
 502 /* Set/get chip/data for an IRQ: */
 503 extern int irq_set_chip(unsigned int irq, struct irq_chip *chip);
 504 extern int irq_set_handler_data(unsigned int irq, void *data);
 505 extern int irq_set_chip_data(unsigned int irq, void *data);
 506 extern int irq_set_irq_type(unsigned int irq, unsigned int type);
 507 extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry);
 508 extern struct irq_data *irq_get_irq_data(unsigned int irq);
 509
 510 static inline struct irq_chip *irq_get_chip(unsigned int irq)
 511 {
 512         struct irq_data *d = irq_get_irq_data(irq);
 513         return d ? d->chip : NULL;
 514 }
 515
 516 static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d)
 517 {
 518         return d->chip;
 519 }
 520
 521 static inline void *irq_get_chip_data(unsigned int irq)
 522 {
 523         struct irq_data *d = irq_get_irq_data(irq);
 524         return d ? d->chip_data : NULL;
 525 }
 526
 527 static inline void *irq_data_get_irq_chip_data(struct irq_data *d)
 528 {
 529         return d->chip_data;
 530 }
 531
 532 static inline void *irq_get_handler_data(unsigned int irq)
 533 {
 534         struct irq_data *d = irq_get_irq_data(irq);
 535         return d ? d->handler_data : NULL;
 536 }
 537
 538 static inline void *irq_data_get_irq_handler_data(struct irq_data *d)
 539 {
 540         return d->handler_data;
 541 }
 542
 543 static inline struct msi_desc *irq_get_msi_desc(unsigned int irq)
 544 {
 545         struct irq_data *d = irq_get_irq_data(irq);
 546         return d ? d->msi_desc : NULL;
 547 }
 548
 549 static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
 550 {
 551         return d->msi_desc;
 552 }
 553
 554 int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node);
 555 void irq_free_descs(unsigned int irq, unsigned int cnt);
 556 int irq_reserve_irqs(unsigned int from, unsigned int cnt);
 557
 558 static inline int irq_alloc_desc(int node)
 559 {
 560         return irq_alloc_descs(-1, 0, 1, node);
 561 }
 562
 563 static inline int irq_alloc_desc_at(unsigned int at, int node)
 564 {
 565         return irq_alloc_descs(at, at, 1, node);
 566 }
 567
 568 static inline int irq_alloc_desc_from(unsigned int from, int node)
 569 {
 570         return irq_alloc_descs(-1, from, 1, node);
 571 }
 572
 573 static inline void irq_free_desc(unsigned int irq)
 574 {
 575         irq_free_descs(irq, 1);
 576 }
 577
 578 static inline int irq_reserve_irq(unsigned int irq)
 579 {
 580         return irq_reserve_irqs(irq, 1);
 581 }
 582
 583 #endif /* CONFIG_GENERIC_HARDIRQS */
 584
 585 #endif /* !CONFIG_S390 */
 586
 587 #endif /* _LINUX_IRQ_H */