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