5 * Please do not include this file in generic code. There is currently
6 * no requirement for any architecture to implement anything held
12 #include <linux/smp.h>
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>
28 #include <asm/ptrace.h>
29 #include <asm/irq_regs.h>
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);
41 * Bits 0-7 are the same as the IRQF_* bits in linux/interrupt.h
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
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 irq_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
62 * IRQ_NOTHREAD - Interrupt cannot be threaded
63 * IRQ_NOAUTOEN - Interrupt is not automatically enabled in
65 * IRQ_NO_BALANCING - Interrupt cannot be balanced (affinity set)
66 * IRQ_MOVE_PCNTXT - Interrupt can be migrated from process context
67 * IRQ_NESTED_TRHEAD - Interrupt nests into another thread
70 IRQ_TYPE_NONE = 0x00000000,
71 IRQ_TYPE_EDGE_RISING = 0x00000001,
72 IRQ_TYPE_EDGE_FALLING = 0x00000002,
73 IRQ_TYPE_EDGE_BOTH = (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING),
74 IRQ_TYPE_LEVEL_HIGH = 0x00000004,
75 IRQ_TYPE_LEVEL_LOW = 0x00000008,
76 IRQ_TYPE_LEVEL_MASK = (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH),
77 IRQ_TYPE_SENSE_MASK = 0x0000000f,
79 IRQ_TYPE_PROBE = 0x00000010,
82 IRQ_PER_CPU = (1 << 9),
83 IRQ_NOPROBE = (1 << 10),
84 IRQ_NOREQUEST = (1 << 11),
85 IRQ_NOAUTOEN = (1 << 12),
86 IRQ_NO_BALANCING = (1 << 13),
87 IRQ_MOVE_PCNTXT = (1 << 14),
88 IRQ_NESTED_THREAD = (1 << 15),
89 IRQ_NOTHREAD = (1 << 16),
92 #define IRQF_MODIFY_MASK \
93 (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
94 IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
95 IRQ_PER_CPU | IRQ_NESTED_THREAD)
97 #define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
99 static inline __deprecated bool CHECK_IRQ_PER_CPU(unsigned int status)
101 return status & IRQ_PER_CPU;
105 * Return value for chip->irq_set_affinity()
107 * IRQ_SET_MASK_OK - OK, core updates irq_data.affinity
108 * IRQ_SET_MASK_NOCPY - OK, chip did update irq_data.affinity
112 IRQ_SET_MASK_OK_NOCOPY,
118 * struct irq_data - per irq and irq chip data passed down to chip functions
119 * @irq: interrupt number
120 * @node: node index useful for balancing
121 * @state_use_accessors: status information for irq chip functions.
122 * Use accessor functions to deal with it
123 * @chip: low level interrupt hardware access
124 * @handler_data: per-IRQ data for the irq_chip methods
125 * @chip_data: platform-specific per-chip private data for the chip
126 * methods, to allow shared chip implementations
127 * @msi_desc: MSI descriptor
128 * @affinity: IRQ affinity on SMP
130 * The fields here need to overlay the ones in irq_desc until we
131 * cleaned up the direct references and switched everything over to
137 unsigned int state_use_accessors;
138 struct irq_chip *chip;
141 struct msi_desc *msi_desc;
143 cpumask_var_t affinity;
148 * Bit masks for irq_data.state
150 * IRQD_TRIGGER_MASK - Mask for the trigger type bits
151 * IRQD_SETAFFINITY_PENDING - Affinity setting is pending
152 * IRQD_NO_BALANCING - Balancing disabled for this IRQ
153 * IRQD_PER_CPU - Interrupt is per cpu
154 * IRQD_AFFINITY_SET - Interrupt affinity was set
155 * IRQD_LEVEL - Interrupt is level triggered
156 * IRQD_WAKEUP_STATE - Interrupt is configured for wakeup
158 * IRDQ_MOVE_PCNTXT - Interrupt can be moved in process
160 * IRQD_IRQ_DISABLED - Disabled state of the interrupt
161 * IRQD_IRQ_MASKED - Masked state of the interrupt
162 * IRQD_IRQ_INPROGRESS - In progress state of the interrupt
165 IRQD_TRIGGER_MASK = 0xf,
166 IRQD_SETAFFINITY_PENDING = (1 << 8),
167 IRQD_NO_BALANCING = (1 << 10),
168 IRQD_PER_CPU = (1 << 11),
169 IRQD_AFFINITY_SET = (1 << 12),
170 IRQD_LEVEL = (1 << 13),
171 IRQD_WAKEUP_STATE = (1 << 14),
172 IRQD_MOVE_PCNTXT = (1 << 15),
173 IRQD_IRQ_DISABLED = (1 << 16),
174 IRQD_IRQ_MASKED = (1 << 17),
175 IRQD_IRQ_INPROGRESS = (1 << 18),
178 static inline bool irqd_is_setaffinity_pending(struct irq_data *d)
180 return d->state_use_accessors & IRQD_SETAFFINITY_PENDING;
183 static inline bool irqd_is_per_cpu(struct irq_data *d)
185 return d->state_use_accessors & IRQD_PER_CPU;
188 static inline bool irqd_can_balance(struct irq_data *d)
190 return !(d->state_use_accessors & (IRQD_PER_CPU | IRQD_NO_BALANCING));
193 static inline bool irqd_affinity_was_set(struct irq_data *d)
195 return d->state_use_accessors & IRQD_AFFINITY_SET;
198 static inline void irqd_mark_affinity_was_set(struct irq_data *d)
200 d->state_use_accessors |= IRQD_AFFINITY_SET;
203 static inline u32 irqd_get_trigger_type(struct irq_data *d)
205 return d->state_use_accessors & IRQD_TRIGGER_MASK;
209 * Must only be called inside irq_chip.irq_set_type() functions.
211 static inline void irqd_set_trigger_type(struct irq_data *d, u32 type)
213 d->state_use_accessors &= ~IRQD_TRIGGER_MASK;
214 d->state_use_accessors |= type & IRQD_TRIGGER_MASK;
217 static inline bool irqd_is_level_type(struct irq_data *d)
219 return d->state_use_accessors & IRQD_LEVEL;
222 static inline bool irqd_is_wakeup_set(struct irq_data *d)
224 return d->state_use_accessors & IRQD_WAKEUP_STATE;
227 static inline bool irqd_can_move_in_process_context(struct irq_data *d)
229 return d->state_use_accessors & IRQD_MOVE_PCNTXT;
232 static inline bool irqd_irq_disabled(struct irq_data *d)
234 return d->state_use_accessors & IRQD_IRQ_DISABLED;
237 static inline bool irqd_irq_masked(struct irq_data *d)
239 return d->state_use_accessors & IRQD_IRQ_MASKED;
242 static inline bool irqd_irq_inprogress(struct irq_data *d)
244 return d->state_use_accessors & IRQD_IRQ_INPROGRESS;
248 * Functions for chained handlers which can be enabled/disabled by the
249 * standard disable_irq/enable_irq calls. Must be called with
250 * irq_desc->lock held.
252 static inline void irqd_set_chained_irq_inprogress(struct irq_data *d)
254 d->state_use_accessors |= IRQD_IRQ_INPROGRESS;
257 static inline void irqd_clr_chained_irq_inprogress(struct irq_data *d)
259 d->state_use_accessors &= ~IRQD_IRQ_INPROGRESS;
263 * struct irq_chip - hardware interrupt chip descriptor
265 * @name: name for /proc/interrupts
266 * @irq_startup: start up the interrupt (defaults to ->enable if NULL)
267 * @irq_shutdown: shut down the interrupt (defaults to ->disable if NULL)
268 * @irq_enable: enable the interrupt (defaults to chip->unmask if NULL)
269 * @irq_disable: disable the interrupt
270 * @irq_ack: start of a new interrupt
271 * @irq_mask: mask an interrupt source
272 * @irq_mask_ack: ack and mask an interrupt source
273 * @irq_unmask: unmask an interrupt source
274 * @irq_eoi: end of interrupt
275 * @irq_set_affinity: set the CPU affinity on SMP machines
276 * @irq_retrigger: resend an IRQ to the CPU
277 * @irq_set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
278 * @irq_set_wake: enable/disable power-management wake-on of an IRQ
279 * @irq_bus_lock: function to lock access to slow bus (i2c) chips
280 * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
281 * @irq_cpu_online: configure an interrupt source for a secondary CPU
282 * @irq_cpu_offline: un-configure an interrupt source for a secondary CPU
283 * @irq_print_chip: optional to print special chip info in show_interrupts
284 * @flags: chip specific flags
286 * @release: release function solely used by UML
290 unsigned int (*irq_startup)(struct irq_data *data);
291 void (*irq_shutdown)(struct irq_data *data);
292 void (*irq_enable)(struct irq_data *data);
293 void (*irq_disable)(struct irq_data *data);
295 void (*irq_ack)(struct irq_data *data);
296 void (*irq_mask)(struct irq_data *data);
297 void (*irq_mask_ack)(struct irq_data *data);
298 void (*irq_unmask)(struct irq_data *data);
299 void (*irq_eoi)(struct irq_data *data);
301 int (*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force);
302 int (*irq_retrigger)(struct irq_data *data);
303 int (*irq_set_type)(struct irq_data *data, unsigned int flow_type);
304 int (*irq_set_wake)(struct irq_data *data, unsigned int on);
306 void (*irq_bus_lock)(struct irq_data *data);
307 void (*irq_bus_sync_unlock)(struct irq_data *data);
309 void (*irq_cpu_online)(struct irq_data *data);
310 void (*irq_cpu_offline)(struct irq_data *data);
312 void (*irq_print_chip)(struct irq_data *data, struct seq_file *p);
316 /* Currently used only by UML, might disappear one day.*/
317 #ifdef CONFIG_IRQ_RELEASE_METHOD
318 void (*release)(unsigned int irq, void *dev_id);
323 * irq_chip specific flags
325 * IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type()
326 * IRQCHIP_EOI_IF_HANDLED: Only issue irq_eoi() when irq was handled
327 * IRQCHIP_MASK_ON_SUSPEND: Mask non wake irqs in the suspend path
328 * IRQCHIP_ONOFFLINE_ENABLED: Only call irq_on/off_line callbacks
332 IRQCHIP_SET_TYPE_MASKED = (1 << 0),
333 IRQCHIP_EOI_IF_HANDLED = (1 << 1),
334 IRQCHIP_MASK_ON_SUSPEND = (1 << 2),
335 IRQCHIP_ONOFFLINE_ENABLED = (1 << 3),
338 /* This include will go away once we isolated irq_desc usage to core code */
339 #include <linux/irqdesc.h>
342 * Pick up the arch-dependent methods:
344 #include <asm/hw_irq.h>
346 #ifndef NR_IRQS_LEGACY
347 # define NR_IRQS_LEGACY 0
350 #ifndef ARCH_IRQ_INIT_FLAGS
351 # define ARCH_IRQ_INIT_FLAGS 0
354 #define IRQ_DEFAULT_INIT_FLAGS ARCH_IRQ_INIT_FLAGS
357 extern int setup_irq(unsigned int irq, struct irqaction *new);
358 extern void remove_irq(unsigned int irq, struct irqaction *act);
360 extern void irq_cpu_online(void);
361 extern void irq_cpu_offline(void);
362 extern int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *cpumask);
364 #ifdef CONFIG_GENERIC_HARDIRQS
366 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
367 void irq_move_irq(struct irq_data *data);
368 void irq_move_masked_irq(struct irq_data *data);
370 static inline void irq_move_irq(struct irq_data *data) { }
371 static inline void irq_move_masked_irq(struct irq_data *data) { }
374 extern int no_irq_affinity;
377 * Built-in IRQ handlers for various IRQ types,
378 * callable via desc->handle_irq()
380 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
381 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
382 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
383 extern void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc);
384 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
385 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
386 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
387 extern void handle_nested_irq(unsigned int irq);
389 /* Handling of unhandled and spurious interrupts: */
390 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
391 irqreturn_t action_ret);
394 /* Enable/disable irq debugging output: */
395 extern int noirqdebug_setup(char *str);
397 /* Checks whether the interrupt can be requested by request_irq(): */
398 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
400 /* Dummy irq-chip implementations: */
401 extern struct irq_chip no_irq_chip;
402 extern struct irq_chip dummy_irq_chip;
405 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
406 irq_flow_handler_t handle, const char *name);
408 static inline void irq_set_chip_and_handler(unsigned int irq, struct irq_chip *chip,
409 irq_flow_handler_t handle)
411 irq_set_chip_and_handler_name(irq, chip, handle, NULL);
415 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
419 irq_set_handler(unsigned int irq, irq_flow_handler_t handle)
421 __irq_set_handler(irq, handle, 0, NULL);
425 * Set a highlevel chained flow handler for a given IRQ.
426 * (a chained handler is automatically enabled and set to
427 * IRQ_NOREQUEST, IRQ_NOPROBE, and IRQ_NOTHREAD)
430 irq_set_chained_handler(unsigned int irq, irq_flow_handler_t handle)
432 __irq_set_handler(irq, handle, 1, NULL);
435 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);
437 static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
439 irq_modify_status(irq, 0, set);
442 static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
444 irq_modify_status(irq, clr, 0);
447 static inline void irq_set_noprobe(unsigned int irq)
449 irq_modify_status(irq, 0, IRQ_NOPROBE);
452 static inline void irq_set_probe(unsigned int irq)
454 irq_modify_status(irq, IRQ_NOPROBE, 0);
457 static inline void irq_set_nothread(unsigned int irq)
459 irq_modify_status(irq, 0, IRQ_NOTHREAD);
462 static inline void irq_set_thread(unsigned int irq)
464 irq_modify_status(irq, IRQ_NOTHREAD, 0);
467 static inline void irq_set_nested_thread(unsigned int irq, bool nest)
470 irq_set_status_flags(irq, IRQ_NESTED_THREAD);
472 irq_clear_status_flags(irq, IRQ_NESTED_THREAD);
475 /* Handle dynamic irq creation and destruction */
476 extern unsigned int create_irq_nr(unsigned int irq_want, int node);
477 extern int create_irq(void);
478 extern void destroy_irq(unsigned int irq);
481 * Dynamic irq helper functions. Obsolete. Use irq_alloc_desc* and
482 * irq_free_desc instead.
484 extern void dynamic_irq_cleanup(unsigned int irq);
485 static inline void dynamic_irq_init(unsigned int irq)
487 dynamic_irq_cleanup(irq);
490 /* Set/get chip/data for an IRQ: */
491 extern int irq_set_chip(unsigned int irq, struct irq_chip *chip);
492 extern int irq_set_handler_data(unsigned int irq, void *data);
493 extern int irq_set_chip_data(unsigned int irq, void *data);
494 extern int irq_set_irq_type(unsigned int irq, unsigned int type);
495 extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry);
496 extern struct irq_data *irq_get_irq_data(unsigned int irq);
498 static inline struct irq_chip *irq_get_chip(unsigned int irq)
500 struct irq_data *d = irq_get_irq_data(irq);
501 return d ? d->chip : NULL;
504 static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d)
509 static inline void *irq_get_chip_data(unsigned int irq)
511 struct irq_data *d = irq_get_irq_data(irq);
512 return d ? d->chip_data : NULL;
515 static inline void *irq_data_get_irq_chip_data(struct irq_data *d)
520 static inline void *irq_get_handler_data(unsigned int irq)
522 struct irq_data *d = irq_get_irq_data(irq);
523 return d ? d->handler_data : NULL;
526 static inline void *irq_data_get_irq_handler_data(struct irq_data *d)
528 return d->handler_data;
531 static inline struct msi_desc *irq_get_msi_desc(unsigned int irq)
533 struct irq_data *d = irq_get_irq_data(irq);
534 return d ? d->msi_desc : NULL;
537 static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
542 int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node);
543 void irq_free_descs(unsigned int irq, unsigned int cnt);
544 int irq_reserve_irqs(unsigned int from, unsigned int cnt);
546 static inline int irq_alloc_desc(int node)
548 return irq_alloc_descs(-1, 0, 1, node);
551 static inline int irq_alloc_desc_at(unsigned int at, int node)
553 return irq_alloc_descs(at, at, 1, node);
556 static inline int irq_alloc_desc_from(unsigned int from, int node)
558 return irq_alloc_descs(-1, from, 1, node);
561 static inline void irq_free_desc(unsigned int irq)
563 irq_free_descs(irq, 1);
566 static inline int irq_reserve_irq(unsigned int irq)
568 return irq_reserve_irqs(irq, 1);
571 #endif /* CONFIG_GENERIC_HARDIRQS */
573 #endif /* !CONFIG_S390 */
575 #endif /* _LINUX_IRQ_H */