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3795de23 TG |
1 | /* |
2 | * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar | |
3 | * Copyright (C) 2005-2006, Thomas Gleixner, Russell King | |
4 | * | |
5 | * This file contains the interrupt descriptor management code | |
6 | * | |
7 | * Detailed information is available in Documentation/DocBook/genericirq | |
8 | * | |
9 | */ | |
10 | #include <linux/irq.h> | |
11 | #include <linux/slab.h> | |
ec53cf23 | 12 | #include <linux/export.h> |
3795de23 TG |
13 | #include <linux/interrupt.h> |
14 | #include <linux/kernel_stat.h> | |
15 | #include <linux/radix-tree.h> | |
1f5a5b87 | 16 | #include <linux/bitmap.h> |
76ba59f8 | 17 | #include <linux/irqdomain.h> |
3795de23 TG |
18 | |
19 | #include "internals.h" | |
20 | ||
21 | /* | |
22 | * lockdep: we want to handle all irq_desc locks as a single lock-class: | |
23 | */ | |
78f90d91 | 24 | static struct lock_class_key irq_desc_lock_class; |
3795de23 | 25 | |
fe051434 | 26 | #if defined(CONFIG_SMP) |
3795de23 TG |
27 | static void __init init_irq_default_affinity(void) |
28 | { | |
29 | alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT); | |
30 | cpumask_setall(irq_default_affinity); | |
31 | } | |
32 | #else | |
33 | static void __init init_irq_default_affinity(void) | |
34 | { | |
35 | } | |
36 | #endif | |
37 | ||
1f5a5b87 TG |
38 | #ifdef CONFIG_SMP |
39 | static int alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) | |
40 | { | |
41 | if (!zalloc_cpumask_var_node(&desc->irq_data.affinity, gfp, node)) | |
42 | return -ENOMEM; | |
43 | ||
44 | #ifdef CONFIG_GENERIC_PENDING_IRQ | |
45 | if (!zalloc_cpumask_var_node(&desc->pending_mask, gfp, node)) { | |
46 | free_cpumask_var(desc->irq_data.affinity); | |
47 | return -ENOMEM; | |
48 | } | |
49 | #endif | |
50 | return 0; | |
51 | } | |
52 | ||
53 | static void desc_smp_init(struct irq_desc *desc, int node) | |
54 | { | |
aa99ec0f | 55 | desc->irq_data.node = node; |
1f5a5b87 | 56 | cpumask_copy(desc->irq_data.affinity, irq_default_affinity); |
b7b29338 TG |
57 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
58 | cpumask_clear(desc->pending_mask); | |
59 | #endif | |
60 | } | |
61 | ||
62 | static inline int desc_node(struct irq_desc *desc) | |
63 | { | |
64 | return desc->irq_data.node; | |
1f5a5b87 TG |
65 | } |
66 | ||
67 | #else | |
68 | static inline int | |
69 | alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) { return 0; } | |
70 | static inline void desc_smp_init(struct irq_desc *desc, int node) { } | |
b7b29338 | 71 | static inline int desc_node(struct irq_desc *desc) { return 0; } |
1f5a5b87 TG |
72 | #endif |
73 | ||
b6873807 SAS |
74 | static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node, |
75 | struct module *owner) | |
1f5a5b87 | 76 | { |
6c9ae009 ED |
77 | int cpu; |
78 | ||
1f5a5b87 TG |
79 | desc->irq_data.irq = irq; |
80 | desc->irq_data.chip = &no_irq_chip; | |
81 | desc->irq_data.chip_data = NULL; | |
82 | desc->irq_data.handler_data = NULL; | |
83 | desc->irq_data.msi_desc = NULL; | |
f9e4989e | 84 | irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS); |
801a0e9a | 85 | irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED); |
1f5a5b87 TG |
86 | desc->handle_irq = handle_bad_irq; |
87 | desc->depth = 1; | |
b7b29338 TG |
88 | desc->irq_count = 0; |
89 | desc->irqs_unhandled = 0; | |
1f5a5b87 | 90 | desc->name = NULL; |
b6873807 | 91 | desc->owner = owner; |
6c9ae009 ED |
92 | for_each_possible_cpu(cpu) |
93 | *per_cpu_ptr(desc->kstat_irqs, cpu) = 0; | |
1f5a5b87 TG |
94 | desc_smp_init(desc, node); |
95 | } | |
96 | ||
3795de23 TG |
97 | int nr_irqs = NR_IRQS; |
98 | EXPORT_SYMBOL_GPL(nr_irqs); | |
99 | ||
a05a900a | 100 | static DEFINE_MUTEX(sparse_irq_lock); |
c1ee6264 | 101 | static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS); |
1f5a5b87 | 102 | |
3795de23 TG |
103 | #ifdef CONFIG_SPARSE_IRQ |
104 | ||
baa0d233 | 105 | static RADIX_TREE(irq_desc_tree, GFP_KERNEL); |
3795de23 | 106 | |
1f5a5b87 | 107 | static void irq_insert_desc(unsigned int irq, struct irq_desc *desc) |
3795de23 TG |
108 | { |
109 | radix_tree_insert(&irq_desc_tree, irq, desc); | |
110 | } | |
111 | ||
112 | struct irq_desc *irq_to_desc(unsigned int irq) | |
113 | { | |
114 | return radix_tree_lookup(&irq_desc_tree, irq); | |
115 | } | |
3911ff30 | 116 | EXPORT_SYMBOL(irq_to_desc); |
3795de23 | 117 | |
1f5a5b87 TG |
118 | static void delete_irq_desc(unsigned int irq) |
119 | { | |
120 | radix_tree_delete(&irq_desc_tree, irq); | |
121 | } | |
122 | ||
123 | #ifdef CONFIG_SMP | |
124 | static void free_masks(struct irq_desc *desc) | |
125 | { | |
126 | #ifdef CONFIG_GENERIC_PENDING_IRQ | |
127 | free_cpumask_var(desc->pending_mask); | |
128 | #endif | |
c0a19ebc | 129 | free_cpumask_var(desc->irq_data.affinity); |
1f5a5b87 TG |
130 | } |
131 | #else | |
132 | static inline void free_masks(struct irq_desc *desc) { } | |
133 | #endif | |
134 | ||
c291ee62 TG |
135 | void irq_lock_sparse(void) |
136 | { | |
137 | mutex_lock(&sparse_irq_lock); | |
138 | } | |
139 | ||
140 | void irq_unlock_sparse(void) | |
141 | { | |
142 | mutex_unlock(&sparse_irq_lock); | |
143 | } | |
144 | ||
b6873807 | 145 | static struct irq_desc *alloc_desc(int irq, int node, struct module *owner) |
1f5a5b87 TG |
146 | { |
147 | struct irq_desc *desc; | |
baa0d233 | 148 | gfp_t gfp = GFP_KERNEL; |
1f5a5b87 TG |
149 | |
150 | desc = kzalloc_node(sizeof(*desc), gfp, node); | |
151 | if (!desc) | |
152 | return NULL; | |
153 | /* allocate based on nr_cpu_ids */ | |
6c9ae009 | 154 | desc->kstat_irqs = alloc_percpu(unsigned int); |
1f5a5b87 TG |
155 | if (!desc->kstat_irqs) |
156 | goto err_desc; | |
157 | ||
158 | if (alloc_masks(desc, gfp, node)) | |
159 | goto err_kstat; | |
160 | ||
161 | raw_spin_lock_init(&desc->lock); | |
162 | lockdep_set_class(&desc->lock, &irq_desc_lock_class); | |
163 | ||
b6873807 | 164 | desc_set_defaults(irq, desc, node, owner); |
1f5a5b87 TG |
165 | |
166 | return desc; | |
167 | ||
168 | err_kstat: | |
6c9ae009 | 169 | free_percpu(desc->kstat_irqs); |
1f5a5b87 TG |
170 | err_desc: |
171 | kfree(desc); | |
172 | return NULL; | |
173 | } | |
174 | ||
175 | static void free_desc(unsigned int irq) | |
176 | { | |
177 | struct irq_desc *desc = irq_to_desc(irq); | |
1f5a5b87 | 178 | |
13bfe99e TG |
179 | unregister_irq_proc(irq, desc); |
180 | ||
c291ee62 TG |
181 | /* |
182 | * sparse_irq_lock protects also show_interrupts() and | |
183 | * kstat_irq_usr(). Once we deleted the descriptor from the | |
184 | * sparse tree we can free it. Access in proc will fail to | |
185 | * lookup the descriptor. | |
186 | */ | |
a05a900a | 187 | mutex_lock(&sparse_irq_lock); |
1f5a5b87 | 188 | delete_irq_desc(irq); |
a05a900a | 189 | mutex_unlock(&sparse_irq_lock); |
1f5a5b87 TG |
190 | |
191 | free_masks(desc); | |
6c9ae009 | 192 | free_percpu(desc->kstat_irqs); |
1f5a5b87 TG |
193 | kfree(desc); |
194 | } | |
195 | ||
b6873807 SAS |
196 | static int alloc_descs(unsigned int start, unsigned int cnt, int node, |
197 | struct module *owner) | |
1f5a5b87 TG |
198 | { |
199 | struct irq_desc *desc; | |
1f5a5b87 TG |
200 | int i; |
201 | ||
202 | for (i = 0; i < cnt; i++) { | |
b6873807 | 203 | desc = alloc_desc(start + i, node, owner); |
1f5a5b87 TG |
204 | if (!desc) |
205 | goto err; | |
a05a900a | 206 | mutex_lock(&sparse_irq_lock); |
1f5a5b87 | 207 | irq_insert_desc(start + i, desc); |
a05a900a | 208 | mutex_unlock(&sparse_irq_lock); |
1f5a5b87 TG |
209 | } |
210 | return start; | |
211 | ||
212 | err: | |
213 | for (i--; i >= 0; i--) | |
214 | free_desc(start + i); | |
215 | ||
a05a900a | 216 | mutex_lock(&sparse_irq_lock); |
1f5a5b87 | 217 | bitmap_clear(allocated_irqs, start, cnt); |
a05a900a | 218 | mutex_unlock(&sparse_irq_lock); |
1f5a5b87 TG |
219 | return -ENOMEM; |
220 | } | |
221 | ||
ed4dea6e | 222 | static int irq_expand_nr_irqs(unsigned int nr) |
e7bcecb7 | 223 | { |
ed4dea6e | 224 | if (nr > IRQ_BITMAP_BITS) |
e7bcecb7 | 225 | return -ENOMEM; |
ed4dea6e | 226 | nr_irqs = nr; |
e7bcecb7 TG |
227 | return 0; |
228 | } | |
229 | ||
3795de23 TG |
230 | int __init early_irq_init(void) |
231 | { | |
b683de2b | 232 | int i, initcnt, node = first_online_node; |
3795de23 | 233 | struct irq_desc *desc; |
3795de23 TG |
234 | |
235 | init_irq_default_affinity(); | |
236 | ||
b683de2b TG |
237 | /* Let arch update nr_irqs and return the nr of preallocated irqs */ |
238 | initcnt = arch_probe_nr_irqs(); | |
239 | printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d %d\n", NR_IRQS, nr_irqs, initcnt); | |
3795de23 | 240 | |
c1ee6264 TG |
241 | if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS)) |
242 | nr_irqs = IRQ_BITMAP_BITS; | |
243 | ||
244 | if (WARN_ON(initcnt > IRQ_BITMAP_BITS)) | |
245 | initcnt = IRQ_BITMAP_BITS; | |
246 | ||
247 | if (initcnt > nr_irqs) | |
248 | nr_irqs = initcnt; | |
249 | ||
b683de2b | 250 | for (i = 0; i < initcnt; i++) { |
b6873807 | 251 | desc = alloc_desc(i, node, NULL); |
aa99ec0f TG |
252 | set_bit(i, allocated_irqs); |
253 | irq_insert_desc(i, desc); | |
3795de23 | 254 | } |
3795de23 TG |
255 | return arch_early_irq_init(); |
256 | } | |
257 | ||
3795de23 TG |
258 | #else /* !CONFIG_SPARSE_IRQ */ |
259 | ||
260 | struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = { | |
261 | [0 ... NR_IRQS-1] = { | |
3795de23 TG |
262 | .handle_irq = handle_bad_irq, |
263 | .depth = 1, | |
264 | .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock), | |
265 | } | |
266 | }; | |
267 | ||
3795de23 TG |
268 | int __init early_irq_init(void) |
269 | { | |
aa99ec0f | 270 | int count, i, node = first_online_node; |
3795de23 | 271 | struct irq_desc *desc; |
3795de23 TG |
272 | |
273 | init_irq_default_affinity(); | |
274 | ||
275 | printk(KERN_INFO "NR_IRQS:%d\n", NR_IRQS); | |
276 | ||
277 | desc = irq_desc; | |
278 | count = ARRAY_SIZE(irq_desc); | |
279 | ||
280 | for (i = 0; i < count; i++) { | |
6c9ae009 | 281 | desc[i].kstat_irqs = alloc_percpu(unsigned int); |
e7fbad30 LW |
282 | alloc_masks(&desc[i], GFP_KERNEL, node); |
283 | raw_spin_lock_init(&desc[i].lock); | |
154cd387 | 284 | lockdep_set_class(&desc[i].lock, &irq_desc_lock_class); |
b6873807 | 285 | desc_set_defaults(i, &desc[i], node, NULL); |
3795de23 TG |
286 | } |
287 | return arch_early_irq_init(); | |
288 | } | |
289 | ||
290 | struct irq_desc *irq_to_desc(unsigned int irq) | |
291 | { | |
292 | return (irq < NR_IRQS) ? irq_desc + irq : NULL; | |
293 | } | |
2c45aada | 294 | EXPORT_SYMBOL(irq_to_desc); |
3795de23 | 295 | |
1f5a5b87 TG |
296 | static void free_desc(unsigned int irq) |
297 | { | |
d8179bc0 TG |
298 | struct irq_desc *desc = irq_to_desc(irq); |
299 | unsigned long flags; | |
300 | ||
301 | raw_spin_lock_irqsave(&desc->lock, flags); | |
302 | desc_set_defaults(irq, desc, desc_node(desc), NULL); | |
303 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
1f5a5b87 TG |
304 | } |
305 | ||
b6873807 SAS |
306 | static inline int alloc_descs(unsigned int start, unsigned int cnt, int node, |
307 | struct module *owner) | |
1f5a5b87 | 308 | { |
b6873807 SAS |
309 | u32 i; |
310 | ||
311 | for (i = 0; i < cnt; i++) { | |
312 | struct irq_desc *desc = irq_to_desc(start + i); | |
313 | ||
314 | desc->owner = owner; | |
315 | } | |
1f5a5b87 TG |
316 | return start; |
317 | } | |
e7bcecb7 | 318 | |
ed4dea6e | 319 | static int irq_expand_nr_irqs(unsigned int nr) |
e7bcecb7 TG |
320 | { |
321 | return -ENOMEM; | |
322 | } | |
323 | ||
f63b6a05 TG |
324 | void irq_mark_irq(unsigned int irq) |
325 | { | |
326 | mutex_lock(&sparse_irq_lock); | |
327 | bitmap_set(allocated_irqs, irq, 1); | |
328 | mutex_unlock(&sparse_irq_lock); | |
329 | } | |
330 | ||
c940e01c TG |
331 | #ifdef CONFIG_GENERIC_IRQ_LEGACY |
332 | void irq_init_desc(unsigned int irq) | |
333 | { | |
d8179bc0 | 334 | free_desc(irq); |
c940e01c TG |
335 | } |
336 | #endif | |
337 | ||
3795de23 TG |
338 | #endif /* !CONFIG_SPARSE_IRQ */ |
339 | ||
fe12bc2c TG |
340 | /** |
341 | * generic_handle_irq - Invoke the handler for a particular irq | |
342 | * @irq: The irq number to handle | |
343 | * | |
344 | */ | |
345 | int generic_handle_irq(unsigned int irq) | |
346 | { | |
347 | struct irq_desc *desc = irq_to_desc(irq); | |
348 | ||
349 | if (!desc) | |
350 | return -EINVAL; | |
351 | generic_handle_irq_desc(irq, desc); | |
352 | return 0; | |
353 | } | |
edf76f83 | 354 | EXPORT_SYMBOL_GPL(generic_handle_irq); |
fe12bc2c | 355 | |
76ba59f8 MZ |
356 | #ifdef CONFIG_HANDLE_DOMAIN_IRQ |
357 | /** | |
358 | * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain | |
359 | * @domain: The domain where to perform the lookup | |
360 | * @hwirq: The HW irq number to convert to a logical one | |
361 | * @lookup: Whether to perform the domain lookup or not | |
362 | * @regs: Register file coming from the low-level handling code | |
363 | * | |
364 | * Returns: 0 on success, or -EINVAL if conversion has failed | |
365 | */ | |
366 | int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq, | |
367 | bool lookup, struct pt_regs *regs) | |
368 | { | |
369 | struct pt_regs *old_regs = set_irq_regs(regs); | |
370 | unsigned int irq = hwirq; | |
371 | int ret = 0; | |
372 | ||
373 | irq_enter(); | |
374 | ||
375 | #ifdef CONFIG_IRQ_DOMAIN | |
376 | if (lookup) | |
377 | irq = irq_find_mapping(domain, hwirq); | |
378 | #endif | |
379 | ||
380 | /* | |
381 | * Some hardware gives randomly wrong interrupts. Rather | |
382 | * than crashing, do something sensible. | |
383 | */ | |
384 | if (unlikely(!irq || irq >= nr_irqs)) { | |
385 | ack_bad_irq(irq); | |
386 | ret = -EINVAL; | |
387 | } else { | |
388 | generic_handle_irq(irq); | |
389 | } | |
390 | ||
391 | irq_exit(); | |
392 | set_irq_regs(old_regs); | |
393 | return ret; | |
394 | } | |
395 | #endif | |
396 | ||
1f5a5b87 TG |
397 | /* Dynamic interrupt handling */ |
398 | ||
399 | /** | |
400 | * irq_free_descs - free irq descriptors | |
401 | * @from: Start of descriptor range | |
402 | * @cnt: Number of consecutive irqs to free | |
403 | */ | |
404 | void irq_free_descs(unsigned int from, unsigned int cnt) | |
405 | { | |
1f5a5b87 TG |
406 | int i; |
407 | ||
408 | if (from >= nr_irqs || (from + cnt) > nr_irqs) | |
409 | return; | |
410 | ||
411 | for (i = 0; i < cnt; i++) | |
412 | free_desc(from + i); | |
413 | ||
a05a900a | 414 | mutex_lock(&sparse_irq_lock); |
1f5a5b87 | 415 | bitmap_clear(allocated_irqs, from, cnt); |
a05a900a | 416 | mutex_unlock(&sparse_irq_lock); |
1f5a5b87 | 417 | } |
edf76f83 | 418 | EXPORT_SYMBOL_GPL(irq_free_descs); |
1f5a5b87 TG |
419 | |
420 | /** | |
421 | * irq_alloc_descs - allocate and initialize a range of irq descriptors | |
422 | * @irq: Allocate for specific irq number if irq >= 0 | |
423 | * @from: Start the search from this irq number | |
424 | * @cnt: Number of consecutive irqs to allocate. | |
425 | * @node: Preferred node on which the irq descriptor should be allocated | |
d522a0d1 | 426 | * @owner: Owning module (can be NULL) |
1f5a5b87 TG |
427 | * |
428 | * Returns the first irq number or error code | |
429 | */ | |
430 | int __ref | |
b6873807 SAS |
431 | __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node, |
432 | struct module *owner) | |
1f5a5b87 | 433 | { |
1f5a5b87 TG |
434 | int start, ret; |
435 | ||
436 | if (!cnt) | |
437 | return -EINVAL; | |
438 | ||
c5182b88 MB |
439 | if (irq >= 0) { |
440 | if (from > irq) | |
441 | return -EINVAL; | |
442 | from = irq; | |
62a08ae2 TG |
443 | } else { |
444 | /* | |
445 | * For interrupts which are freely allocated the | |
446 | * architecture can force a lower bound to the @from | |
447 | * argument. x86 uses this to exclude the GSI space. | |
448 | */ | |
449 | from = arch_dynirq_lower_bound(from); | |
c5182b88 MB |
450 | } |
451 | ||
a05a900a | 452 | mutex_lock(&sparse_irq_lock); |
1f5a5b87 | 453 | |
ed4dea6e YL |
454 | start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS, |
455 | from, cnt, 0); | |
1f5a5b87 TG |
456 | ret = -EEXIST; |
457 | if (irq >=0 && start != irq) | |
458 | goto err; | |
459 | ||
ed4dea6e YL |
460 | if (start + cnt > nr_irqs) { |
461 | ret = irq_expand_nr_irqs(start + cnt); | |
e7bcecb7 TG |
462 | if (ret) |
463 | goto err; | |
464 | } | |
1f5a5b87 TG |
465 | |
466 | bitmap_set(allocated_irqs, start, cnt); | |
a05a900a | 467 | mutex_unlock(&sparse_irq_lock); |
b6873807 | 468 | return alloc_descs(start, cnt, node, owner); |
1f5a5b87 TG |
469 | |
470 | err: | |
a05a900a | 471 | mutex_unlock(&sparse_irq_lock); |
1f5a5b87 TG |
472 | return ret; |
473 | } | |
b6873807 | 474 | EXPORT_SYMBOL_GPL(__irq_alloc_descs); |
1f5a5b87 | 475 | |
7b6ef126 TG |
476 | #ifdef CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ |
477 | /** | |
478 | * irq_alloc_hwirqs - Allocate an irq descriptor and initialize the hardware | |
479 | * @cnt: number of interrupts to allocate | |
480 | * @node: node on which to allocate | |
481 | * | |
482 | * Returns an interrupt number > 0 or 0, if the allocation fails. | |
483 | */ | |
484 | unsigned int irq_alloc_hwirqs(int cnt, int node) | |
485 | { | |
486 | int i, irq = __irq_alloc_descs(-1, 0, cnt, node, NULL); | |
487 | ||
488 | if (irq < 0) | |
489 | return 0; | |
490 | ||
491 | for (i = irq; cnt > 0; i++, cnt--) { | |
492 | if (arch_setup_hwirq(i, node)) | |
493 | goto err; | |
494 | irq_clear_status_flags(i, _IRQ_NOREQUEST); | |
495 | } | |
496 | return irq; | |
497 | ||
498 | err: | |
499 | for (i--; i >= irq; i--) { | |
500 | irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE); | |
501 | arch_teardown_hwirq(i); | |
502 | } | |
503 | irq_free_descs(irq, cnt); | |
504 | return 0; | |
505 | } | |
506 | EXPORT_SYMBOL_GPL(irq_alloc_hwirqs); | |
507 | ||
508 | /** | |
509 | * irq_free_hwirqs - Free irq descriptor and cleanup the hardware | |
510 | * @from: Free from irq number | |
511 | * @cnt: number of interrupts to free | |
512 | * | |
513 | */ | |
514 | void irq_free_hwirqs(unsigned int from, int cnt) | |
515 | { | |
8844aad8 | 516 | int i, j; |
7b6ef126 | 517 | |
8844aad8 | 518 | for (i = from, j = cnt; j > 0; i++, j--) { |
7b6ef126 TG |
519 | irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE); |
520 | arch_teardown_hwirq(i); | |
521 | } | |
522 | irq_free_descs(from, cnt); | |
523 | } | |
524 | EXPORT_SYMBOL_GPL(irq_free_hwirqs); | |
525 | #endif | |
526 | ||
a98d24b7 TG |
527 | /** |
528 | * irq_get_next_irq - get next allocated irq number | |
529 | * @offset: where to start the search | |
530 | * | |
531 | * Returns next irq number after offset or nr_irqs if none is found. | |
532 | */ | |
533 | unsigned int irq_get_next_irq(unsigned int offset) | |
534 | { | |
535 | return find_next_bit(allocated_irqs, nr_irqs, offset); | |
536 | } | |
537 | ||
d5eb4ad2 | 538 | struct irq_desc * |
31d9d9b6 MZ |
539 | __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, |
540 | unsigned int check) | |
d5eb4ad2 TG |
541 | { |
542 | struct irq_desc *desc = irq_to_desc(irq); | |
543 | ||
544 | if (desc) { | |
31d9d9b6 MZ |
545 | if (check & _IRQ_DESC_CHECK) { |
546 | if ((check & _IRQ_DESC_PERCPU) && | |
547 | !irq_settings_is_per_cpu_devid(desc)) | |
548 | return NULL; | |
549 | ||
550 | if (!(check & _IRQ_DESC_PERCPU) && | |
551 | irq_settings_is_per_cpu_devid(desc)) | |
552 | return NULL; | |
553 | } | |
554 | ||
d5eb4ad2 TG |
555 | if (bus) |
556 | chip_bus_lock(desc); | |
557 | raw_spin_lock_irqsave(&desc->lock, *flags); | |
558 | } | |
559 | return desc; | |
560 | } | |
561 | ||
562 | void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus) | |
563 | { | |
564 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
565 | if (bus) | |
566 | chip_bus_sync_unlock(desc); | |
567 | } | |
568 | ||
31d9d9b6 MZ |
569 | int irq_set_percpu_devid(unsigned int irq) |
570 | { | |
571 | struct irq_desc *desc = irq_to_desc(irq); | |
572 | ||
573 | if (!desc) | |
574 | return -EINVAL; | |
575 | ||
576 | if (desc->percpu_enabled) | |
577 | return -EINVAL; | |
578 | ||
579 | desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL); | |
580 | ||
581 | if (!desc->percpu_enabled) | |
582 | return -ENOMEM; | |
583 | ||
584 | irq_set_percpu_devid_flags(irq); | |
585 | return 0; | |
586 | } | |
587 | ||
792d0018 TG |
588 | void kstat_incr_irq_this_cpu(unsigned int irq) |
589 | { | |
590 | kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq)); | |
591 | } | |
592 | ||
c291ee62 TG |
593 | /** |
594 | * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu | |
595 | * @irq: The interrupt number | |
596 | * @cpu: The cpu number | |
597 | * | |
598 | * Returns the sum of interrupt counts on @cpu since boot for | |
599 | * @irq. The caller must ensure that the interrupt is not removed | |
600 | * concurrently. | |
601 | */ | |
3795de23 TG |
602 | unsigned int kstat_irqs_cpu(unsigned int irq, int cpu) |
603 | { | |
604 | struct irq_desc *desc = irq_to_desc(irq); | |
6c9ae009 ED |
605 | |
606 | return desc && desc->kstat_irqs ? | |
607 | *per_cpu_ptr(desc->kstat_irqs, cpu) : 0; | |
3795de23 | 608 | } |
478735e3 | 609 | |
c291ee62 TG |
610 | /** |
611 | * kstat_irqs - Get the statistics for an interrupt | |
612 | * @irq: The interrupt number | |
613 | * | |
614 | * Returns the sum of interrupt counts on all cpus since boot for | |
615 | * @irq. The caller must ensure that the interrupt is not removed | |
616 | * concurrently. | |
617 | */ | |
478735e3 KH |
618 | unsigned int kstat_irqs(unsigned int irq) |
619 | { | |
620 | struct irq_desc *desc = irq_to_desc(irq); | |
621 | int cpu; | |
622 | int sum = 0; | |
623 | ||
6c9ae009 | 624 | if (!desc || !desc->kstat_irqs) |
478735e3 KH |
625 | return 0; |
626 | for_each_possible_cpu(cpu) | |
6c9ae009 | 627 | sum += *per_cpu_ptr(desc->kstat_irqs, cpu); |
478735e3 KH |
628 | return sum; |
629 | } | |
c291ee62 TG |
630 | |
631 | /** | |
632 | * kstat_irqs_usr - Get the statistics for an interrupt | |
633 | * @irq: The interrupt number | |
634 | * | |
635 | * Returns the sum of interrupt counts on all cpus since boot for | |
636 | * @irq. Contrary to kstat_irqs() this can be called from any | |
637 | * preemptible context. It's protected against concurrent removal of | |
638 | * an interrupt descriptor when sparse irqs are enabled. | |
639 | */ | |
640 | unsigned int kstat_irqs_usr(unsigned int irq) | |
641 | { | |
642 | int sum; | |
643 | ||
644 | irq_lock_sparse(); | |
645 | sum = kstat_irqs(irq); | |
646 | irq_unlock_sparse(); | |
647 | return sum; | |
648 | } |