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[karo-tx-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_startup(struct irq_desc *desc, bool resend, bool force);
78
79 extern void irq_shutdown(struct irq_desc *desc);
80 extern void irq_enable(struct irq_desc *desc);
81 extern void irq_disable(struct irq_desc *desc);
82 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
83 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
84 extern void mask_irq(struct irq_desc *desc);
85 extern void unmask_irq(struct irq_desc *desc);
86 extern void unmask_threaded_irq(struct irq_desc *desc);
87
88 #ifdef CONFIG_SPARSE_IRQ
89 static inline void irq_mark_irq(unsigned int irq) { }
90 #else
91 extern void irq_mark_irq(unsigned int irq);
92 #endif
93
94 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
95
96 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags);
97 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
98 irqreturn_t handle_irq_event(struct irq_desc *desc);
99
100 /* Resending of interrupts :*/
101 void check_irq_resend(struct irq_desc *desc);
102 bool irq_wait_for_poll(struct irq_desc *desc);
103 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
104
105 #ifdef CONFIG_PROC_FS
106 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
107 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
108 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
109 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
110 #else
111 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
112 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
113 static inline void register_handler_proc(unsigned int irq,
114                                          struct irqaction *action) { }
115 static inline void unregister_handler_proc(unsigned int irq,
116                                            struct irqaction *action) { }
117 #endif
118
119 extern bool irq_can_set_affinity_usr(unsigned int irq);
120
121 extern int irq_select_affinity_usr(unsigned int irq);
122
123 extern void irq_set_thread_affinity(struct irq_desc *desc);
124
125 extern int irq_do_set_affinity(struct irq_data *data,
126                                const struct cpumask *dest, bool force);
127
128 #ifdef CONFIG_SMP
129 extern int irq_setup_affinity(struct irq_desc *desc);
130 #else
131 static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
132 #endif
133
134 /* Inline functions for support of irq chips on slow busses */
135 static inline void chip_bus_lock(struct irq_desc *desc)
136 {
137         if (unlikely(desc->irq_data.chip->irq_bus_lock))
138                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
139 }
140
141 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
142 {
143         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
144                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
145 }
146
147 #define _IRQ_DESC_CHECK         (1 << 0)
148 #define _IRQ_DESC_PERCPU        (1 << 1)
149
150 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
151 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
152
153 #define for_each_action_of_desc(desc, act)                      \
154         for (act = desc->act; act; act = act->next)
155
156 struct irq_desc *
157 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
158                     unsigned int check);
159 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
160
161 static inline struct irq_desc *
162 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
163 {
164         return __irq_get_desc_lock(irq, flags, true, check);
165 }
166
167 static inline void
168 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
169 {
170         __irq_put_desc_unlock(desc, flags, true);
171 }
172
173 static inline struct irq_desc *
174 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
175 {
176         return __irq_get_desc_lock(irq, flags, false, check);
177 }
178
179 static inline void
180 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
181 {
182         __irq_put_desc_unlock(desc, flags, false);
183 }
184
185 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
186
187 static inline unsigned int irqd_get(struct irq_data *d)
188 {
189         return __irqd_to_state(d);
190 }
191
192 /*
193  * Manipulation functions for irq_data.state
194  */
195 static inline void irqd_set_move_pending(struct irq_data *d)
196 {
197         __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
198 }
199
200 static inline void irqd_clr_move_pending(struct irq_data *d)
201 {
202         __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
203 }
204
205 static inline void irqd_set_managed_shutdown(struct irq_data *d)
206 {
207         __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
208 }
209
210 static inline void irqd_clr_managed_shutdown(struct irq_data *d)
211 {
212         __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
213 }
214
215 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
216 {
217         __irqd_to_state(d) &= ~mask;
218 }
219
220 static inline void irqd_set(struct irq_data *d, unsigned int mask)
221 {
222         __irqd_to_state(d) |= mask;
223 }
224
225 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
226 {
227         return __irqd_to_state(d) & mask;
228 }
229
230 static inline void irq_state_set_disabled(struct irq_desc *desc)
231 {
232         irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
233 }
234
235 static inline void irq_state_set_masked(struct irq_desc *desc)
236 {
237         irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
238 }
239
240 #undef __irqd_to_state
241
242 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
243 {
244         __this_cpu_inc(*desc->kstat_irqs);
245         __this_cpu_inc(kstat.irqs_sum);
246 }
247
248 static inline int irq_desc_get_node(struct irq_desc *desc)
249 {
250         return irq_common_data_get_node(&desc->irq_common_data);
251 }
252
253 static inline int irq_desc_is_chained(struct irq_desc *desc)
254 {
255         return (desc->action && desc->action == &chained_action);
256 }
257
258 #ifdef CONFIG_PM_SLEEP
259 bool irq_pm_check_wakeup(struct irq_desc *desc);
260 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
261 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
262 #else
263 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
264 static inline void
265 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
266 static inline void
267 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
268 #endif
269
270 #ifdef CONFIG_IRQ_TIMINGS
271
272 #define IRQ_TIMINGS_SHIFT       5
273 #define IRQ_TIMINGS_SIZE        (1 << IRQ_TIMINGS_SHIFT)
274 #define IRQ_TIMINGS_MASK        (IRQ_TIMINGS_SIZE - 1)
275
276 /**
277  * struct irq_timings - irq timings storing structure
278  * @values: a circular buffer of u64 encoded <timestamp,irq> values
279  * @count: the number of elements in the array
280  */
281 struct irq_timings {
282         u64     values[IRQ_TIMINGS_SIZE];
283         int     count;
284 };
285
286 DECLARE_PER_CPU(struct irq_timings, irq_timings);
287
288 extern void irq_timings_free(int irq);
289 extern int irq_timings_alloc(int irq);
290
291 static inline void irq_remove_timings(struct irq_desc *desc)
292 {
293         desc->istate &= ~IRQS_TIMINGS;
294
295         irq_timings_free(irq_desc_get_irq(desc));
296 }
297
298 static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
299 {
300         int irq = irq_desc_get_irq(desc);
301         int ret;
302
303         /*
304          * We don't need the measurement because the idle code already
305          * knows the next expiry event.
306          */
307         if (act->flags & __IRQF_TIMER)
308                 return;
309
310         /*
311          * In case the timing allocation fails, we just want to warn,
312          * not fail, so letting the system boot anyway.
313          */
314         ret = irq_timings_alloc(irq);
315         if (ret) {
316                 pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
317                         irq, ret);
318                 return;
319         }
320
321         desc->istate |= IRQS_TIMINGS;
322 }
323
324 extern void irq_timings_enable(void);
325 extern void irq_timings_disable(void);
326
327 DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
328
329 /*
330  * The interrupt number and the timestamp are encoded into a single
331  * u64 variable to optimize the size.
332  * 48 bit time stamp and 16 bit IRQ number is way sufficient.
333  *  Who cares an IRQ after 78 hours of idle time?
334  */
335 static inline u64 irq_timing_encode(u64 timestamp, int irq)
336 {
337         return (timestamp << 16) | irq;
338 }
339
340 static inline int irq_timing_decode(u64 value, u64 *timestamp)
341 {
342         *timestamp = value >> 16;
343         return value & U16_MAX;
344 }
345
346 /*
347  * The function record_irq_time is only called in one place in the
348  * interrupts handler. We want this function always inline so the code
349  * inside is embedded in the function and the static key branching
350  * code can act at the higher level. Without the explicit
351  * __always_inline we can end up with a function call and a small
352  * overhead in the hotpath for nothing.
353  */
354 static __always_inline void record_irq_time(struct irq_desc *desc)
355 {
356         if (!static_branch_likely(&irq_timing_enabled))
357                 return;
358
359         if (desc->istate & IRQS_TIMINGS) {
360                 struct irq_timings *timings = this_cpu_ptr(&irq_timings);
361
362                 timings->values[timings->count & IRQ_TIMINGS_MASK] =
363                         irq_timing_encode(local_clock(),
364                                           irq_desc_get_irq(desc));
365
366                 timings->count++;
367         }
368 }
369 #else
370 static inline void irq_remove_timings(struct irq_desc *desc) {}
371 static inline void irq_setup_timings(struct irq_desc *desc,
372                                      struct irqaction *act) {};
373 static inline void record_irq_time(struct irq_desc *desc) {}
374 #endif /* CONFIG_IRQ_TIMINGS */
375
376
377 #ifdef CONFIG_GENERIC_IRQ_CHIP
378 void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
379                            int num_ct, unsigned int irq_base,
380                            void __iomem *reg_base, irq_flow_handler_t handler);
381 #else
382 static inline void
383 irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
384                       int num_ct, unsigned int irq_base,
385                       void __iomem *reg_base, irq_flow_handler_t handler) { }
386 #endif /* CONFIG_GENERIC_IRQ_CHIP */
387
388 #ifdef CONFIG_GENERIC_PENDING_IRQ
389 static inline bool irq_can_move_pcntxt(struct irq_data *data)
390 {
391         return irqd_can_move_in_process_context(data);
392 }
393 static inline bool irq_move_pending(struct irq_data *data)
394 {
395         return irqd_is_setaffinity_pending(data);
396 }
397 static inline void
398 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
399 {
400         cpumask_copy(desc->pending_mask, mask);
401 }
402 static inline void
403 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
404 {
405         cpumask_copy(mask, desc->pending_mask);
406 }
407 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
408 {
409         return desc->pending_mask;
410 }
411 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
412 #else /* CONFIG_GENERIC_PENDING_IRQ */
413 static inline bool irq_can_move_pcntxt(struct irq_data *data)
414 {
415         return true;
416 }
417 static inline bool irq_move_pending(struct irq_data *data)
418 {
419         return false;
420 }
421 static inline void
422 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
423 {
424 }
425 static inline void
426 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
427 {
428 }
429 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
430 {
431         return NULL;
432 }
433 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
434 {
435         return false;
436 }
437 #endif /* !CONFIG_GENERIC_PENDING_IRQ */
438
439 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
440 #include <linux/debugfs.h>
441
442 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
443 static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
444 {
445         debugfs_remove(desc->debugfs_file);
446 }
447 # ifdef CONFIG_IRQ_DOMAIN
448 void irq_domain_debugfs_init(struct dentry *root);
449 # else
450 static inline void irq_domain_debugfs_init(struct dentry *root)
451 {
452 }
453 # endif
454 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */
455 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
456 {
457 }
458 static inline void irq_remove_debugfs_entry(struct irq_desc *d)
459 {
460 }
461 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */