]> Git Repo - linux.git/blob - kernel/irq/internals.h
x86/vector/msi: Select CONFIG_GENERIC_IRQ_RESERVATION_MODE
[linux.git] / kernel / irq / internals.h
1 /*
2  * IRQ subsystem internal functions and variables:
3  *
4  * Do not ever include this file from anything else than
5  * kernel/irq/. Do not even think about using any information outside
6  * of this file for your non core code.
7  */
8 #include <linux/irqdesc.h>
9 #include <linux/kernel_stat.h>
10 #include <linux/pm_runtime.h>
11 #include <linux/sched/clock.h>
12
13 #ifdef CONFIG_SPARSE_IRQ
14 # define IRQ_BITMAP_BITS        (NR_IRQS + 8196)
15 #else
16 # define IRQ_BITMAP_BITS        NR_IRQS
17 #endif
18
19 #define istate core_internal_state__do_not_mess_with_it
20
21 extern bool noirqdebug;
22
23 extern struct irqaction chained_action;
24
25 /*
26  * Bits used by threaded handlers:
27  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
28  * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
29  * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
30  * IRQTF_FORCED_THREAD  - irq action is force threaded
31  */
32 enum {
33         IRQTF_RUNTHREAD,
34         IRQTF_WARNED,
35         IRQTF_AFFINITY,
36         IRQTF_FORCED_THREAD,
37 };
38
39 /*
40  * Bit masks for desc->core_internal_state__do_not_mess_with_it
41  *
42  * IRQS_AUTODETECT              - autodetection in progress
43  * IRQS_SPURIOUS_DISABLED       - was disabled due to spurious interrupt
44  *                                detection
45  * IRQS_POLL_INPROGRESS         - polling in progress
46  * IRQS_ONESHOT                 - irq is not unmasked in primary handler
47  * IRQS_REPLAY                  - irq is replayed
48  * IRQS_WAITING                 - irq is waiting
49  * IRQS_PENDING                 - irq is pending and replayed later
50  * IRQS_SUSPENDED               - irq is suspended
51  */
52 enum {
53         IRQS_AUTODETECT         = 0x00000001,
54         IRQS_SPURIOUS_DISABLED  = 0x00000002,
55         IRQS_POLL_INPROGRESS    = 0x00000008,
56         IRQS_ONESHOT            = 0x00000020,
57         IRQS_REPLAY             = 0x00000040,
58         IRQS_WAITING            = 0x00000080,
59         IRQS_PENDING            = 0x00000200,
60         IRQS_SUSPENDED          = 0x00000800,
61         IRQS_TIMINGS            = 0x00001000,
62 };
63
64 #include "debug.h"
65 #include "settings.h"
66
67 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
68 extern void __disable_irq(struct irq_desc *desc);
69 extern void __enable_irq(struct irq_desc *desc);
70
71 #define IRQ_RESEND      true
72 #define IRQ_NORESEND    false
73
74 #define IRQ_START_FORCE true
75 #define IRQ_START_COND  false
76
77 extern int irq_activate(struct irq_desc *desc);
78 extern void irq_activate_and_startup(struct irq_desc *desc, bool resend);
79 extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
80
81 extern void irq_shutdown(struct irq_desc *desc);
82 extern void irq_enable(struct irq_desc *desc);
83 extern void irq_disable(struct irq_desc *desc);
84 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
85 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
86 extern void mask_irq(struct irq_desc *desc);
87 extern void unmask_irq(struct irq_desc *desc);
88 extern void unmask_threaded_irq(struct irq_desc *desc);
89
90 #ifdef CONFIG_SPARSE_IRQ
91 static inline void irq_mark_irq(unsigned int irq) { }
92 #else
93 extern void irq_mark_irq(unsigned int irq);
94 #endif
95
96 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
97
98 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags);
99 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
100 irqreturn_t handle_irq_event(struct irq_desc *desc);
101
102 /* Resending of interrupts :*/
103 void check_irq_resend(struct irq_desc *desc);
104 bool irq_wait_for_poll(struct irq_desc *desc);
105 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
106
107 #ifdef CONFIG_PROC_FS
108 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
109 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
110 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
111 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
112 #else
113 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
114 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
115 static inline void register_handler_proc(unsigned int irq,
116                                          struct irqaction *action) { }
117 static inline void unregister_handler_proc(unsigned int irq,
118                                            struct irqaction *action) { }
119 #endif
120
121 extern bool irq_can_set_affinity_usr(unsigned int irq);
122
123 extern int irq_select_affinity_usr(unsigned int irq);
124
125 extern void irq_set_thread_affinity(struct irq_desc *desc);
126
127 extern int irq_do_set_affinity(struct irq_data *data,
128                                const struct cpumask *dest, bool force);
129
130 #ifdef CONFIG_SMP
131 extern int irq_setup_affinity(struct irq_desc *desc);
132 #else
133 static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
134 #endif
135
136 /* Inline functions for support of irq chips on slow busses */
137 static inline void chip_bus_lock(struct irq_desc *desc)
138 {
139         if (unlikely(desc->irq_data.chip->irq_bus_lock))
140                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
141 }
142
143 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
144 {
145         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
146                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
147 }
148
149 #define _IRQ_DESC_CHECK         (1 << 0)
150 #define _IRQ_DESC_PERCPU        (1 << 1)
151
152 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
153 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
154
155 #define for_each_action_of_desc(desc, act)                      \
156         for (act = desc->action; act; act = act->next)
157
158 struct irq_desc *
159 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
160                     unsigned int check);
161 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
162
163 static inline struct irq_desc *
164 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
165 {
166         return __irq_get_desc_lock(irq, flags, true, check);
167 }
168
169 static inline void
170 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
171 {
172         __irq_put_desc_unlock(desc, flags, true);
173 }
174
175 static inline struct irq_desc *
176 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
177 {
178         return __irq_get_desc_lock(irq, flags, false, check);
179 }
180
181 static inline void
182 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
183 {
184         __irq_put_desc_unlock(desc, flags, false);
185 }
186
187 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
188
189 static inline unsigned int irqd_get(struct irq_data *d)
190 {
191         return __irqd_to_state(d);
192 }
193
194 /*
195  * Manipulation functions for irq_data.state
196  */
197 static inline void irqd_set_move_pending(struct irq_data *d)
198 {
199         __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
200 }
201
202 static inline void irqd_clr_move_pending(struct irq_data *d)
203 {
204         __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
205 }
206
207 static inline void irqd_set_managed_shutdown(struct irq_data *d)
208 {
209         __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
210 }
211
212 static inline void irqd_clr_managed_shutdown(struct irq_data *d)
213 {
214         __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
215 }
216
217 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
218 {
219         __irqd_to_state(d) &= ~mask;
220 }
221
222 static inline void irqd_set(struct irq_data *d, unsigned int mask)
223 {
224         __irqd_to_state(d) |= mask;
225 }
226
227 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
228 {
229         return __irqd_to_state(d) & mask;
230 }
231
232 static inline void irq_state_set_disabled(struct irq_desc *desc)
233 {
234         irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
235 }
236
237 static inline void irq_state_set_masked(struct irq_desc *desc)
238 {
239         irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
240 }
241
242 #undef __irqd_to_state
243
244 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
245 {
246         __this_cpu_inc(*desc->kstat_irqs);
247         __this_cpu_inc(kstat.irqs_sum);
248 }
249
250 static inline int irq_desc_get_node(struct irq_desc *desc)
251 {
252         return irq_common_data_get_node(&desc->irq_common_data);
253 }
254
255 static inline int irq_desc_is_chained(struct irq_desc *desc)
256 {
257         return (desc->action && desc->action == &chained_action);
258 }
259
260 #ifdef CONFIG_PM_SLEEP
261 bool irq_pm_check_wakeup(struct irq_desc *desc);
262 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
263 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
264 #else
265 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
266 static inline void
267 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
268 static inline void
269 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
270 #endif
271
272 #ifdef CONFIG_IRQ_TIMINGS
273
274 #define IRQ_TIMINGS_SHIFT       5
275 #define IRQ_TIMINGS_SIZE        (1 << IRQ_TIMINGS_SHIFT)
276 #define IRQ_TIMINGS_MASK        (IRQ_TIMINGS_SIZE - 1)
277
278 /**
279  * struct irq_timings - irq timings storing structure
280  * @values: a circular buffer of u64 encoded <timestamp,irq> values
281  * @count: the number of elements in the array
282  */
283 struct irq_timings {
284         u64     values[IRQ_TIMINGS_SIZE];
285         int     count;
286 };
287
288 DECLARE_PER_CPU(struct irq_timings, irq_timings);
289
290 extern void irq_timings_free(int irq);
291 extern int irq_timings_alloc(int irq);
292
293 static inline void irq_remove_timings(struct irq_desc *desc)
294 {
295         desc->istate &= ~IRQS_TIMINGS;
296
297         irq_timings_free(irq_desc_get_irq(desc));
298 }
299
300 static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
301 {
302         int irq = irq_desc_get_irq(desc);
303         int ret;
304
305         /*
306          * We don't need the measurement because the idle code already
307          * knows the next expiry event.
308          */
309         if (act->flags & __IRQF_TIMER)
310                 return;
311
312         /*
313          * In case the timing allocation fails, we just want to warn,
314          * not fail, so letting the system boot anyway.
315          */
316         ret = irq_timings_alloc(irq);
317         if (ret) {
318                 pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
319                         irq, ret);
320                 return;
321         }
322
323         desc->istate |= IRQS_TIMINGS;
324 }
325
326 extern void irq_timings_enable(void);
327 extern void irq_timings_disable(void);
328
329 DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
330
331 /*
332  * The interrupt number and the timestamp are encoded into a single
333  * u64 variable to optimize the size.
334  * 48 bit time stamp and 16 bit IRQ number is way sufficient.
335  *  Who cares an IRQ after 78 hours of idle time?
336  */
337 static inline u64 irq_timing_encode(u64 timestamp, int irq)
338 {
339         return (timestamp << 16) | irq;
340 }
341
342 static inline int irq_timing_decode(u64 value, u64 *timestamp)
343 {
344         *timestamp = value >> 16;
345         return value & U16_MAX;
346 }
347
348 /*
349  * The function record_irq_time is only called in one place in the
350  * interrupts handler. We want this function always inline so the code
351  * inside is embedded in the function and the static key branching
352  * code can act at the higher level. Without the explicit
353  * __always_inline we can end up with a function call and a small
354  * overhead in the hotpath for nothing.
355  */
356 static __always_inline void record_irq_time(struct irq_desc *desc)
357 {
358         if (!static_branch_likely(&irq_timing_enabled))
359                 return;
360
361         if (desc->istate & IRQS_TIMINGS) {
362                 struct irq_timings *timings = this_cpu_ptr(&irq_timings);
363
364                 timings->values[timings->count & IRQ_TIMINGS_MASK] =
365                         irq_timing_encode(local_clock(),
366                                           irq_desc_get_irq(desc));
367
368                 timings->count++;
369         }
370 }
371 #else
372 static inline void irq_remove_timings(struct irq_desc *desc) {}
373 static inline void irq_setup_timings(struct irq_desc *desc,
374                                      struct irqaction *act) {};
375 static inline void record_irq_time(struct irq_desc *desc) {}
376 #endif /* CONFIG_IRQ_TIMINGS */
377
378
379 #ifdef CONFIG_GENERIC_IRQ_CHIP
380 void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
381                            int num_ct, unsigned int irq_base,
382                            void __iomem *reg_base, irq_flow_handler_t handler);
383 #else
384 static inline void
385 irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
386                       int num_ct, unsigned int irq_base,
387                       void __iomem *reg_base, irq_flow_handler_t handler) { }
388 #endif /* CONFIG_GENERIC_IRQ_CHIP */
389
390 #ifdef CONFIG_GENERIC_PENDING_IRQ
391 static inline bool irq_can_move_pcntxt(struct irq_data *data)
392 {
393         return irqd_can_move_in_process_context(data);
394 }
395 static inline bool irq_move_pending(struct irq_data *data)
396 {
397         return irqd_is_setaffinity_pending(data);
398 }
399 static inline void
400 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
401 {
402         cpumask_copy(desc->pending_mask, mask);
403 }
404 static inline void
405 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
406 {
407         cpumask_copy(mask, desc->pending_mask);
408 }
409 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
410 {
411         return desc->pending_mask;
412 }
413 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
414 #else /* CONFIG_GENERIC_PENDING_IRQ */
415 static inline bool irq_can_move_pcntxt(struct irq_data *data)
416 {
417         return true;
418 }
419 static inline bool irq_move_pending(struct irq_data *data)
420 {
421         return false;
422 }
423 static inline void
424 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
425 {
426 }
427 static inline void
428 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
429 {
430 }
431 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
432 {
433         return NULL;
434 }
435 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
436 {
437         return false;
438 }
439 #endif /* !CONFIG_GENERIC_PENDING_IRQ */
440
441 #if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY)
442 static inline int irq_domain_activate_irq(struct irq_data *data, bool early)
443 {
444         irqd_set_activated(data);
445         return 0;
446 }
447 static inline void irq_domain_deactivate_irq(struct irq_data *data)
448 {
449         irqd_clr_activated(data);
450 }
451 #endif
452
453 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
454 #include <linux/debugfs.h>
455
456 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
457 static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
458 {
459         debugfs_remove(desc->debugfs_file);
460         kfree(desc->dev_name);
461 }
462 void irq_debugfs_copy_devname(int irq, struct device *dev);
463 # ifdef CONFIG_IRQ_DOMAIN
464 void irq_domain_debugfs_init(struct dentry *root);
465 # else
466 static inline void irq_domain_debugfs_init(struct dentry *root)
467 {
468 }
469 # endif
470 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */
471 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
472 {
473 }
474 static inline void irq_remove_debugfs_entry(struct irq_desc *d)
475 {
476 }
477 static inline void irq_debugfs_copy_devname(int irq, struct device *dev)
478 {
479 }
480 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */
This page took 0.058825 seconds and 4 git commands to generate.