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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>
12#include <linux/export.h>
13#include <linux/interrupt.h>
14#include <linux/kernel_stat.h>
15#include <linux/radix-tree.h>
16#include <linux/bitmap.h>
17
18#include "internals.h"
19
20/*
21 * lockdep: we want to handle all irq_desc locks as a single lock-class:
22 */
23static struct lock_class_key irq_desc_lock_class;
24
25#if defined(CONFIG_SMP)
26static void __init init_irq_default_affinity(void)
27{
28 alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
29 cpumask_setall(irq_default_affinity);
30}
31#else
32static void __init init_irq_default_affinity(void)
33{
34}
35#endif
36
37#ifdef CONFIG_SMP
38static int alloc_masks(struct irq_desc *desc, gfp_t gfp, int node)
39{
40 if (!zalloc_cpumask_var_node(&desc->irq_data.affinity, gfp, node))
41 return -ENOMEM;
42
43#ifdef CONFIG_GENERIC_PENDING_IRQ
44 if (!zalloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
45 free_cpumask_var(desc->irq_data.affinity);
46 return -ENOMEM;
47 }
48#endif
49 return 0;
50}
51
52static void desc_smp_init(struct irq_desc *desc, int node)
53{
54 desc->irq_data.node = node;
55 cpumask_copy(desc->irq_data.affinity, irq_default_affinity);
56#ifdef CONFIG_GENERIC_PENDING_IRQ
57 cpumask_clear(desc->pending_mask);
58#endif
59}
60
61static inline int desc_node(struct irq_desc *desc)
62{
63 return desc->irq_data.node;
64}
65
66#else
67static inline int
68alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) { return 0; }
69static inline void desc_smp_init(struct irq_desc *desc, int node) { }
70static inline int desc_node(struct irq_desc *desc) { return 0; }
71#endif
72
73static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
74 struct module *owner)
75{
76 int cpu;
77
78 desc->irq_data.irq = irq;
79 desc->irq_data.chip = &no_irq_chip;
80 desc->irq_data.chip_data = NULL;
81 desc->irq_data.handler_data = NULL;
82 desc->irq_data.msi_desc = NULL;
83 irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
84 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
85 desc->handle_irq = handle_bad_irq;
86 desc->depth = 1;
87 desc->irq_count = 0;
88 desc->irqs_unhandled = 0;
89 desc->name = NULL;
90 desc->owner = owner;
91 for_each_possible_cpu(cpu)
92 *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
93 desc_smp_init(desc, node);
94}
95
96int nr_irqs = NR_IRQS;
97EXPORT_SYMBOL_GPL(nr_irqs);
98
99static DEFINE_MUTEX(sparse_irq_lock);
100static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS);
101
102#ifdef CONFIG_SPARSE_IRQ
103
104static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
105
106static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
107{
108 radix_tree_insert(&irq_desc_tree, irq, desc);
109}
110
111struct irq_desc *irq_to_desc(unsigned int irq)
112{
113 return radix_tree_lookup(&irq_desc_tree, irq);
114}
115EXPORT_SYMBOL(irq_to_desc);
116
117static void delete_irq_desc(unsigned int irq)
118{
119 radix_tree_delete(&irq_desc_tree, irq);
120}
121
122#ifdef CONFIG_SMP
123static void free_masks(struct irq_desc *desc)
124{
125#ifdef CONFIG_GENERIC_PENDING_IRQ
126 free_cpumask_var(desc->pending_mask);
127#endif
128 free_cpumask_var(desc->irq_data.affinity);
129}
130#else
131static inline void free_masks(struct irq_desc *desc) { }
132#endif
133
134static struct irq_desc *alloc_desc(int irq, int node, struct module *owner)
135{
136 struct irq_desc *desc;
137 gfp_t gfp = GFP_KERNEL;
138
139 desc = kzalloc_node(sizeof(*desc), gfp, node);
140 if (!desc)
141 return NULL;
142 /* allocate based on nr_cpu_ids */
143 desc->kstat_irqs = alloc_percpu(unsigned int);
144 if (!desc->kstat_irqs)
145 goto err_desc;
146
147 if (alloc_masks(desc, gfp, node))
148 goto err_kstat;
149
150 raw_spin_lock_init(&desc->lock);
151 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
152
153 desc_set_defaults(irq, desc, node, owner);
154
155 return desc;
156
157err_kstat:
158 free_percpu(desc->kstat_irqs);
159err_desc:
160 kfree(desc);
161 return NULL;
162}
163
164static void free_desc(unsigned int irq)
165{
166 struct irq_desc *desc = irq_to_desc(irq);
167
168 unregister_irq_proc(irq, desc);
169
170 mutex_lock(&sparse_irq_lock);
171 delete_irq_desc(irq);
172 mutex_unlock(&sparse_irq_lock);
173
174 free_masks(desc);
175 free_percpu(desc->kstat_irqs);
176 kfree(desc);
177}
178
179static int alloc_descs(unsigned int start, unsigned int cnt, int node,
180 struct module *owner)
181{
182 struct irq_desc *desc;
183 int i;
184
185 for (i = 0; i < cnt; i++) {
186 desc = alloc_desc(start + i, node, owner);
187 if (!desc)
188 goto err;
189 mutex_lock(&sparse_irq_lock);
190 irq_insert_desc(start + i, desc);
191 mutex_unlock(&sparse_irq_lock);
192 }
193 return start;
194
195err:
196 for (i--; i >= 0; i--)
197 free_desc(start + i);
198
199 mutex_lock(&sparse_irq_lock);
200 bitmap_clear(allocated_irqs, start, cnt);
201 mutex_unlock(&sparse_irq_lock);
202 return -ENOMEM;
203}
204
205static int irq_expand_nr_irqs(unsigned int nr)
206{
207 if (nr > IRQ_BITMAP_BITS)
208 return -ENOMEM;
209 nr_irqs = nr;
210 return 0;
211}
212
213int __init early_irq_init(void)
214{
215 int i, initcnt, node = first_online_node;
216 struct irq_desc *desc;
217
218 init_irq_default_affinity();
219
220 /* Let arch update nr_irqs and return the nr of preallocated irqs */
221 initcnt = arch_probe_nr_irqs();
222 printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d %d\n", NR_IRQS, nr_irqs, initcnt);
223
224 if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
225 nr_irqs = IRQ_BITMAP_BITS;
226
227 if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
228 initcnt = IRQ_BITMAP_BITS;
229
230 if (initcnt > nr_irqs)
231 nr_irqs = initcnt;
232
233 for (i = 0; i < initcnt; i++) {
234 desc = alloc_desc(i, node, NULL);
235 set_bit(i, allocated_irqs);
236 irq_insert_desc(i, desc);
237 }
238 return arch_early_irq_init();
239}
240
241#else /* !CONFIG_SPARSE_IRQ */
242
243struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
244 [0 ... NR_IRQS-1] = {
245 .handle_irq = handle_bad_irq,
246 .depth = 1,
247 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
248 }
249};
250
251int __init early_irq_init(void)
252{
253 int count, i, node = first_online_node;
254 struct irq_desc *desc;
255
256 init_irq_default_affinity();
257
258 printk(KERN_INFO "NR_IRQS:%d\n", NR_IRQS);
259
260 desc = irq_desc;
261 count = ARRAY_SIZE(irq_desc);
262
263 for (i = 0; i < count; i++) {
264 desc[i].kstat_irqs = alloc_percpu(unsigned int);
265 alloc_masks(&desc[i], GFP_KERNEL, node);
266 raw_spin_lock_init(&desc[i].lock);
267 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
268 desc_set_defaults(i, &desc[i], node, NULL);
269 }
270 return arch_early_irq_init();
271}
272
273struct irq_desc *irq_to_desc(unsigned int irq)
274{
275 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
276}
277EXPORT_SYMBOL(irq_to_desc);
278
279static void free_desc(unsigned int irq)
280{
281 dynamic_irq_cleanup(irq);
282}
283
284static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
285 struct module *owner)
286{
287 u32 i;
288
289 for (i = 0; i < cnt; i++) {
290 struct irq_desc *desc = irq_to_desc(start + i);
291
292 desc->owner = owner;
293 }
294 return start;
295}
296
297static int irq_expand_nr_irqs(unsigned int nr)
298{
299 return -ENOMEM;
300}
301
302#endif /* !CONFIG_SPARSE_IRQ */
303
304/**
305 * generic_handle_irq - Invoke the handler for a particular irq
306 * @irq: The irq number to handle
307 *
308 */
309int generic_handle_irq(unsigned int irq)
310{
311 struct irq_desc *desc = irq_to_desc(irq);
312
313 if (!desc)
314 return -EINVAL;
315 generic_handle_irq_desc(irq, desc);
316 return 0;
317}
318EXPORT_SYMBOL_GPL(generic_handle_irq);
319
320/* Dynamic interrupt handling */
321
322/**
323 * irq_free_descs - free irq descriptors
324 * @from: Start of descriptor range
325 * @cnt: Number of consecutive irqs to free
326 */
327void irq_free_descs(unsigned int from, unsigned int cnt)
328{
329 int i;
330
331 if (from >= nr_irqs || (from + cnt) > nr_irqs)
332 return;
333
334 for (i = 0; i < cnt; i++)
335 free_desc(from + i);
336
337 mutex_lock(&sparse_irq_lock);
338 bitmap_clear(allocated_irqs, from, cnt);
339 mutex_unlock(&sparse_irq_lock);
340}
341EXPORT_SYMBOL_GPL(irq_free_descs);
342
343/**
344 * irq_alloc_descs - allocate and initialize a range of irq descriptors
345 * @irq: Allocate for specific irq number if irq >= 0
346 * @from: Start the search from this irq number
347 * @cnt: Number of consecutive irqs to allocate.
348 * @node: Preferred node on which the irq descriptor should be allocated
349 * @owner: Owning module (can be NULL)
350 *
351 * Returns the first irq number or error code
352 */
353int __ref
354__irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
355 struct module *owner)
356{
357 int start, ret;
358
359 if (!cnt)
360 return -EINVAL;
361
362 if (irq >= 0) {
363 if (from > irq)
364 return -EINVAL;
365 from = irq;
366 } else {
367 /*
368 * For interrupts which are freely allocated the
369 * architecture can force a lower bound to the @from
370 * argument. x86 uses this to exclude the GSI space.
371 */
372 from = arch_dynirq_lower_bound(from);
373 }
374
375 mutex_lock(&sparse_irq_lock);
376
377 start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
378 from, cnt, 0);
379 ret = -EEXIST;
380 if (irq >=0 && start != irq)
381 goto err;
382
383 if (start + cnt > nr_irqs) {
384 ret = irq_expand_nr_irqs(start + cnt);
385 if (ret)
386 goto err;
387 }
388
389 bitmap_set(allocated_irqs, start, cnt);
390 mutex_unlock(&sparse_irq_lock);
391 return alloc_descs(start, cnt, node, owner);
392
393err:
394 mutex_unlock(&sparse_irq_lock);
395 return ret;
396}
397EXPORT_SYMBOL_GPL(__irq_alloc_descs);
398
399/**
400 * irq_reserve_irqs - mark irqs allocated
401 * @from: mark from irq number
402 * @cnt: number of irqs to mark
403 *
404 * Returns 0 on success or an appropriate error code
405 */
406int irq_reserve_irqs(unsigned int from, unsigned int cnt)
407{
408 unsigned int start;
409 int ret = 0;
410
411 if (!cnt || (from + cnt) > nr_irqs)
412 return -EINVAL;
413
414 mutex_lock(&sparse_irq_lock);
415 start = bitmap_find_next_zero_area(allocated_irqs, nr_irqs, from, cnt, 0);
416 if (start == from)
417 bitmap_set(allocated_irqs, start, cnt);
418 else
419 ret = -EEXIST;
420 mutex_unlock(&sparse_irq_lock);
421 return ret;
422}
423
424/**
425 * irq_get_next_irq - get next allocated irq number
426 * @offset: where to start the search
427 *
428 * Returns next irq number after offset or nr_irqs if none is found.
429 */
430unsigned int irq_get_next_irq(unsigned int offset)
431{
432 return find_next_bit(allocated_irqs, nr_irqs, offset);
433}
434
435struct irq_desc *
436__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
437 unsigned int check)
438{
439 struct irq_desc *desc = irq_to_desc(irq);
440
441 if (desc) {
442 if (check & _IRQ_DESC_CHECK) {
443 if ((check & _IRQ_DESC_PERCPU) &&
444 !irq_settings_is_per_cpu_devid(desc))
445 return NULL;
446
447 if (!(check & _IRQ_DESC_PERCPU) &&
448 irq_settings_is_per_cpu_devid(desc))
449 return NULL;
450 }
451
452 if (bus)
453 chip_bus_lock(desc);
454 raw_spin_lock_irqsave(&desc->lock, *flags);
455 }
456 return desc;
457}
458
459void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
460{
461 raw_spin_unlock_irqrestore(&desc->lock, flags);
462 if (bus)
463 chip_bus_sync_unlock(desc);
464}
465
466int irq_set_percpu_devid(unsigned int irq)
467{
468 struct irq_desc *desc = irq_to_desc(irq);
469
470 if (!desc)
471 return -EINVAL;
472
473 if (desc->percpu_enabled)
474 return -EINVAL;
475
476 desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
477
478 if (!desc->percpu_enabled)
479 return -ENOMEM;
480
481 irq_set_percpu_devid_flags(irq);
482 return 0;
483}
484
485/**
486 * dynamic_irq_cleanup - cleanup a dynamically allocated irq
487 * @irq: irq number to initialize
488 */
489void dynamic_irq_cleanup(unsigned int irq)
490{
491 struct irq_desc *desc = irq_to_desc(irq);
492 unsigned long flags;
493
494 raw_spin_lock_irqsave(&desc->lock, flags);
495 desc_set_defaults(irq, desc, desc_node(desc), NULL);
496 raw_spin_unlock_irqrestore(&desc->lock, flags);
497}
498
499void kstat_incr_irq_this_cpu(unsigned int irq)
500{
501 kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
502}
503
504unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
505{
506 struct irq_desc *desc = irq_to_desc(irq);
507
508 return desc && desc->kstat_irqs ?
509 *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
510}
511
512unsigned int kstat_irqs(unsigned int irq)
513{
514 struct irq_desc *desc = irq_to_desc(irq);
515 int cpu;
516 int sum = 0;
517
518 if (!desc || !desc->kstat_irqs)
519 return 0;
520 for_each_possible_cpu(cpu)
521 sum += *per_cpu_ptr(desc->kstat_irqs, cpu);
522 return sum;
523}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
5 *
6 * This file contains the interrupt descriptor management code. Detailed
7 * information is available in Documentation/core-api/genericirq.rst
8 *
9 */
10#include <linux/irq.h>
11#include <linux/slab.h>
12#include <linux/export.h>
13#include <linux/interrupt.h>
14#include <linux/kernel_stat.h>
15#include <linux/radix-tree.h>
16#include <linux/bitmap.h>
17#include <linux/irqdomain.h>
18#include <linux/sysfs.h>
19
20#include "internals.h"
21
22/*
23 * lockdep: we want to handle all irq_desc locks as a single lock-class:
24 */
25static struct lock_class_key irq_desc_lock_class;
26
27#if defined(CONFIG_SMP)
28static int __init irq_affinity_setup(char *str)
29{
30 alloc_bootmem_cpumask_var(&irq_default_affinity);
31 cpulist_parse(str, irq_default_affinity);
32 /*
33 * Set at least the boot cpu. We don't want to end up with
34 * bugreports caused by random comandline masks
35 */
36 cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
37 return 1;
38}
39__setup("irqaffinity=", irq_affinity_setup);
40
41static void __init init_irq_default_affinity(void)
42{
43 if (!cpumask_available(irq_default_affinity))
44 zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
45 if (cpumask_empty(irq_default_affinity))
46 cpumask_setall(irq_default_affinity);
47}
48#else
49static void __init init_irq_default_affinity(void)
50{
51}
52#endif
53
54#ifdef CONFIG_SMP
55static int alloc_masks(struct irq_desc *desc, int node)
56{
57 if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity,
58 GFP_KERNEL, node))
59 return -ENOMEM;
60
61#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
62 if (!zalloc_cpumask_var_node(&desc->irq_common_data.effective_affinity,
63 GFP_KERNEL, node)) {
64 free_cpumask_var(desc->irq_common_data.affinity);
65 return -ENOMEM;
66 }
67#endif
68
69#ifdef CONFIG_GENERIC_PENDING_IRQ
70 if (!zalloc_cpumask_var_node(&desc->pending_mask, GFP_KERNEL, node)) {
71#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
72 free_cpumask_var(desc->irq_common_data.effective_affinity);
73#endif
74 free_cpumask_var(desc->irq_common_data.affinity);
75 return -ENOMEM;
76 }
77#endif
78 return 0;
79}
80
81static void desc_smp_init(struct irq_desc *desc, int node,
82 const struct cpumask *affinity)
83{
84 if (!affinity)
85 affinity = irq_default_affinity;
86 cpumask_copy(desc->irq_common_data.affinity, affinity);
87
88#ifdef CONFIG_GENERIC_PENDING_IRQ
89 cpumask_clear(desc->pending_mask);
90#endif
91#ifdef CONFIG_NUMA
92 desc->irq_common_data.node = node;
93#endif
94}
95
96#else
97static inline int
98alloc_masks(struct irq_desc *desc, int node) { return 0; }
99static inline void
100desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { }
101#endif
102
103static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
104 const struct cpumask *affinity, struct module *owner)
105{
106 int cpu;
107
108 desc->irq_common_data.handler_data = NULL;
109 desc->irq_common_data.msi_desc = NULL;
110
111 desc->irq_data.common = &desc->irq_common_data;
112 desc->irq_data.irq = irq;
113 desc->irq_data.chip = &no_irq_chip;
114 desc->irq_data.chip_data = NULL;
115 irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
116 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
117 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
118 desc->handle_irq = handle_bad_irq;
119 desc->depth = 1;
120 desc->irq_count = 0;
121 desc->irqs_unhandled = 0;
122 desc->name = NULL;
123 desc->owner = owner;
124 for_each_possible_cpu(cpu)
125 *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
126 desc_smp_init(desc, node, affinity);
127}
128
129int nr_irqs = NR_IRQS;
130EXPORT_SYMBOL_GPL(nr_irqs);
131
132static DEFINE_MUTEX(sparse_irq_lock);
133static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS);
134
135#ifdef CONFIG_SPARSE_IRQ
136
137static void irq_kobj_release(struct kobject *kobj);
138
139#ifdef CONFIG_SYSFS
140static struct kobject *irq_kobj_base;
141
142#define IRQ_ATTR_RO(_name) \
143static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
144
145static ssize_t per_cpu_count_show(struct kobject *kobj,
146 struct kobj_attribute *attr, char *buf)
147{
148 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
149 int cpu, irq = desc->irq_data.irq;
150 ssize_t ret = 0;
151 char *p = "";
152
153 for_each_possible_cpu(cpu) {
154 unsigned int c = kstat_irqs_cpu(irq, cpu);
155
156 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);
157 p = ",";
158 }
159
160 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
161 return ret;
162}
163IRQ_ATTR_RO(per_cpu_count);
164
165static ssize_t chip_name_show(struct kobject *kobj,
166 struct kobj_attribute *attr, char *buf)
167{
168 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
169 ssize_t ret = 0;
170
171 raw_spin_lock_irq(&desc->lock);
172 if (desc->irq_data.chip && desc->irq_data.chip->name) {
173 ret = scnprintf(buf, PAGE_SIZE, "%s\n",
174 desc->irq_data.chip->name);
175 }
176 raw_spin_unlock_irq(&desc->lock);
177
178 return ret;
179}
180IRQ_ATTR_RO(chip_name);
181
182static ssize_t hwirq_show(struct kobject *kobj,
183 struct kobj_attribute *attr, char *buf)
184{
185 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
186 ssize_t ret = 0;
187
188 raw_spin_lock_irq(&desc->lock);
189 if (desc->irq_data.domain)
190 ret = sprintf(buf, "%d\n", (int)desc->irq_data.hwirq);
191 raw_spin_unlock_irq(&desc->lock);
192
193 return ret;
194}
195IRQ_ATTR_RO(hwirq);
196
197static ssize_t type_show(struct kobject *kobj,
198 struct kobj_attribute *attr, char *buf)
199{
200 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
201 ssize_t ret = 0;
202
203 raw_spin_lock_irq(&desc->lock);
204 ret = sprintf(buf, "%s\n",
205 irqd_is_level_type(&desc->irq_data) ? "level" : "edge");
206 raw_spin_unlock_irq(&desc->lock);
207
208 return ret;
209
210}
211IRQ_ATTR_RO(type);
212
213static ssize_t wakeup_show(struct kobject *kobj,
214 struct kobj_attribute *attr, char *buf)
215{
216 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
217 ssize_t ret = 0;
218
219 raw_spin_lock_irq(&desc->lock);
220 ret = sprintf(buf, "%s\n",
221 irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled");
222 raw_spin_unlock_irq(&desc->lock);
223
224 return ret;
225
226}
227IRQ_ATTR_RO(wakeup);
228
229static ssize_t name_show(struct kobject *kobj,
230 struct kobj_attribute *attr, char *buf)
231{
232 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
233 ssize_t ret = 0;
234
235 raw_spin_lock_irq(&desc->lock);
236 if (desc->name)
237 ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);
238 raw_spin_unlock_irq(&desc->lock);
239
240 return ret;
241}
242IRQ_ATTR_RO(name);
243
244static ssize_t actions_show(struct kobject *kobj,
245 struct kobj_attribute *attr, char *buf)
246{
247 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
248 struct irqaction *action;
249 ssize_t ret = 0;
250 char *p = "";
251
252 raw_spin_lock_irq(&desc->lock);
253 for (action = desc->action; action != NULL; action = action->next) {
254 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
255 p, action->name);
256 p = ",";
257 }
258 raw_spin_unlock_irq(&desc->lock);
259
260 if (ret)
261 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
262
263 return ret;
264}
265IRQ_ATTR_RO(actions);
266
267static struct attribute *irq_attrs[] = {
268 &per_cpu_count_attr.attr,
269 &chip_name_attr.attr,
270 &hwirq_attr.attr,
271 &type_attr.attr,
272 &wakeup_attr.attr,
273 &name_attr.attr,
274 &actions_attr.attr,
275 NULL
276};
277
278static struct kobj_type irq_kobj_type = {
279 .release = irq_kobj_release,
280 .sysfs_ops = &kobj_sysfs_ops,
281 .default_attrs = irq_attrs,
282};
283
284static void irq_sysfs_add(int irq, struct irq_desc *desc)
285{
286 if (irq_kobj_base) {
287 /*
288 * Continue even in case of failure as this is nothing
289 * crucial.
290 */
291 if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))
292 pr_warn("Failed to add kobject for irq %d\n", irq);
293 }
294}
295
296static int __init irq_sysfs_init(void)
297{
298 struct irq_desc *desc;
299 int irq;
300
301 /* Prevent concurrent irq alloc/free */
302 irq_lock_sparse();
303
304 irq_kobj_base = kobject_create_and_add("irq", kernel_kobj);
305 if (!irq_kobj_base) {
306 irq_unlock_sparse();
307 return -ENOMEM;
308 }
309
310 /* Add the already allocated interrupts */
311 for_each_irq_desc(irq, desc)
312 irq_sysfs_add(irq, desc);
313 irq_unlock_sparse();
314
315 return 0;
316}
317postcore_initcall(irq_sysfs_init);
318
319#else /* !CONFIG_SYSFS */
320
321static struct kobj_type irq_kobj_type = {
322 .release = irq_kobj_release,
323};
324
325static void irq_sysfs_add(int irq, struct irq_desc *desc) {}
326
327#endif /* CONFIG_SYSFS */
328
329static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
330
331static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
332{
333 radix_tree_insert(&irq_desc_tree, irq, desc);
334}
335
336struct irq_desc *irq_to_desc(unsigned int irq)
337{
338 return radix_tree_lookup(&irq_desc_tree, irq);
339}
340EXPORT_SYMBOL(irq_to_desc);
341
342static void delete_irq_desc(unsigned int irq)
343{
344 radix_tree_delete(&irq_desc_tree, irq);
345}
346
347#ifdef CONFIG_SMP
348static void free_masks(struct irq_desc *desc)
349{
350#ifdef CONFIG_GENERIC_PENDING_IRQ
351 free_cpumask_var(desc->pending_mask);
352#endif
353 free_cpumask_var(desc->irq_common_data.affinity);
354#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
355 free_cpumask_var(desc->irq_common_data.effective_affinity);
356#endif
357}
358#else
359static inline void free_masks(struct irq_desc *desc) { }
360#endif
361
362void irq_lock_sparse(void)
363{
364 mutex_lock(&sparse_irq_lock);
365}
366
367void irq_unlock_sparse(void)
368{
369 mutex_unlock(&sparse_irq_lock);
370}
371
372static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
373 const struct cpumask *affinity,
374 struct module *owner)
375{
376 struct irq_desc *desc;
377
378 desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
379 if (!desc)
380 return NULL;
381 /* allocate based on nr_cpu_ids */
382 desc->kstat_irqs = alloc_percpu(unsigned int);
383 if (!desc->kstat_irqs)
384 goto err_desc;
385
386 if (alloc_masks(desc, node))
387 goto err_kstat;
388
389 raw_spin_lock_init(&desc->lock);
390 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
391 mutex_init(&desc->request_mutex);
392 init_rcu_head(&desc->rcu);
393
394 desc_set_defaults(irq, desc, node, affinity, owner);
395 irqd_set(&desc->irq_data, flags);
396 kobject_init(&desc->kobj, &irq_kobj_type);
397
398 return desc;
399
400err_kstat:
401 free_percpu(desc->kstat_irqs);
402err_desc:
403 kfree(desc);
404 return NULL;
405}
406
407static void irq_kobj_release(struct kobject *kobj)
408{
409 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
410
411 free_masks(desc);
412 free_percpu(desc->kstat_irqs);
413 kfree(desc);
414}
415
416static void delayed_free_desc(struct rcu_head *rhp)
417{
418 struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
419
420 kobject_put(&desc->kobj);
421}
422
423static void free_desc(unsigned int irq)
424{
425 struct irq_desc *desc = irq_to_desc(irq);
426
427 irq_remove_debugfs_entry(desc);
428 unregister_irq_proc(irq, desc);
429
430 /*
431 * sparse_irq_lock protects also show_interrupts() and
432 * kstat_irq_usr(). Once we deleted the descriptor from the
433 * sparse tree we can free it. Access in proc will fail to
434 * lookup the descriptor.
435 *
436 * The sysfs entry must be serialized against a concurrent
437 * irq_sysfs_init() as well.
438 */
439 kobject_del(&desc->kobj);
440 delete_irq_desc(irq);
441
442 /*
443 * We free the descriptor, masks and stat fields via RCU. That
444 * allows demultiplex interrupts to do rcu based management of
445 * the child interrupts.
446 */
447 call_rcu(&desc->rcu, delayed_free_desc);
448}
449
450static int alloc_descs(unsigned int start, unsigned int cnt, int node,
451 const struct cpumask *affinity, struct module *owner)
452{
453 const struct cpumask *mask = NULL;
454 struct irq_desc *desc;
455 unsigned int flags;
456 int i;
457
458 /* Validate affinity mask(s) */
459 if (affinity) {
460 for (i = 0, mask = affinity; i < cnt; i++, mask++) {
461 if (cpumask_empty(mask))
462 return -EINVAL;
463 }
464 }
465
466 flags = affinity ? IRQD_AFFINITY_MANAGED | IRQD_MANAGED_SHUTDOWN : 0;
467 mask = NULL;
468
469 for (i = 0; i < cnt; i++) {
470 if (affinity) {
471 node = cpu_to_node(cpumask_first(affinity));
472 mask = affinity;
473 affinity++;
474 }
475 desc = alloc_desc(start + i, node, flags, mask, owner);
476 if (!desc)
477 goto err;
478 irq_insert_desc(start + i, desc);
479 irq_sysfs_add(start + i, desc);
480 irq_add_debugfs_entry(start + i, desc);
481 }
482 bitmap_set(allocated_irqs, start, cnt);
483 return start;
484
485err:
486 for (i--; i >= 0; i--)
487 free_desc(start + i);
488 return -ENOMEM;
489}
490
491static int irq_expand_nr_irqs(unsigned int nr)
492{
493 if (nr > IRQ_BITMAP_BITS)
494 return -ENOMEM;
495 nr_irqs = nr;
496 return 0;
497}
498
499int __init early_irq_init(void)
500{
501 int i, initcnt, node = first_online_node;
502 struct irq_desc *desc;
503
504 init_irq_default_affinity();
505
506 /* Let arch update nr_irqs and return the nr of preallocated irqs */
507 initcnt = arch_probe_nr_irqs();
508 printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n",
509 NR_IRQS, nr_irqs, initcnt);
510
511 if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
512 nr_irqs = IRQ_BITMAP_BITS;
513
514 if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
515 initcnt = IRQ_BITMAP_BITS;
516
517 if (initcnt > nr_irqs)
518 nr_irqs = initcnt;
519
520 for (i = 0; i < initcnt; i++) {
521 desc = alloc_desc(i, node, 0, NULL, NULL);
522 set_bit(i, allocated_irqs);
523 irq_insert_desc(i, desc);
524 }
525 return arch_early_irq_init();
526}
527
528#else /* !CONFIG_SPARSE_IRQ */
529
530struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
531 [0 ... NR_IRQS-1] = {
532 .handle_irq = handle_bad_irq,
533 .depth = 1,
534 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
535 }
536};
537
538int __init early_irq_init(void)
539{
540 int count, i, node = first_online_node;
541 struct irq_desc *desc;
542
543 init_irq_default_affinity();
544
545 printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
546
547 desc = irq_desc;
548 count = ARRAY_SIZE(irq_desc);
549
550 for (i = 0; i < count; i++) {
551 desc[i].kstat_irqs = alloc_percpu(unsigned int);
552 alloc_masks(&desc[i], node);
553 raw_spin_lock_init(&desc[i].lock);
554 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
555 desc_set_defaults(i, &desc[i], node, NULL, NULL);
556 }
557 return arch_early_irq_init();
558}
559
560struct irq_desc *irq_to_desc(unsigned int irq)
561{
562 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
563}
564EXPORT_SYMBOL(irq_to_desc);
565
566static void free_desc(unsigned int irq)
567{
568 struct irq_desc *desc = irq_to_desc(irq);
569 unsigned long flags;
570
571 raw_spin_lock_irqsave(&desc->lock, flags);
572 desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
573 raw_spin_unlock_irqrestore(&desc->lock, flags);
574}
575
576static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
577 const struct cpumask *affinity,
578 struct module *owner)
579{
580 u32 i;
581
582 for (i = 0; i < cnt; i++) {
583 struct irq_desc *desc = irq_to_desc(start + i);
584
585 desc->owner = owner;
586 }
587 bitmap_set(allocated_irqs, start, cnt);
588 return start;
589}
590
591static int irq_expand_nr_irqs(unsigned int nr)
592{
593 return -ENOMEM;
594}
595
596void irq_mark_irq(unsigned int irq)
597{
598 mutex_lock(&sparse_irq_lock);
599 bitmap_set(allocated_irqs, irq, 1);
600 mutex_unlock(&sparse_irq_lock);
601}
602
603#ifdef CONFIG_GENERIC_IRQ_LEGACY
604void irq_init_desc(unsigned int irq)
605{
606 free_desc(irq);
607}
608#endif
609
610#endif /* !CONFIG_SPARSE_IRQ */
611
612/**
613 * generic_handle_irq - Invoke the handler for a particular irq
614 * @irq: The irq number to handle
615 *
616 */
617int generic_handle_irq(unsigned int irq)
618{
619 struct irq_desc *desc = irq_to_desc(irq);
620
621 if (!desc)
622 return -EINVAL;
623 generic_handle_irq_desc(desc);
624 return 0;
625}
626EXPORT_SYMBOL_GPL(generic_handle_irq);
627
628#ifdef CONFIG_HANDLE_DOMAIN_IRQ
629/**
630 * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain
631 * @domain: The domain where to perform the lookup
632 * @hwirq: The HW irq number to convert to a logical one
633 * @lookup: Whether to perform the domain lookup or not
634 * @regs: Register file coming from the low-level handling code
635 *
636 * Returns: 0 on success, or -EINVAL if conversion has failed
637 */
638int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
639 bool lookup, struct pt_regs *regs)
640{
641 struct pt_regs *old_regs = set_irq_regs(regs);
642 unsigned int irq = hwirq;
643 int ret = 0;
644
645 irq_enter();
646
647#ifdef CONFIG_IRQ_DOMAIN
648 if (lookup)
649 irq = irq_find_mapping(domain, hwirq);
650#endif
651
652 /*
653 * Some hardware gives randomly wrong interrupts. Rather
654 * than crashing, do something sensible.
655 */
656 if (unlikely(!irq || irq >= nr_irqs)) {
657 ack_bad_irq(irq);
658 ret = -EINVAL;
659 } else {
660 generic_handle_irq(irq);
661 }
662
663 irq_exit();
664 set_irq_regs(old_regs);
665 return ret;
666}
667#endif
668
669/* Dynamic interrupt handling */
670
671/**
672 * irq_free_descs - free irq descriptors
673 * @from: Start of descriptor range
674 * @cnt: Number of consecutive irqs to free
675 */
676void irq_free_descs(unsigned int from, unsigned int cnt)
677{
678 int i;
679
680 if (from >= nr_irqs || (from + cnt) > nr_irqs)
681 return;
682
683 mutex_lock(&sparse_irq_lock);
684 for (i = 0; i < cnt; i++)
685 free_desc(from + i);
686
687 bitmap_clear(allocated_irqs, from, cnt);
688 mutex_unlock(&sparse_irq_lock);
689}
690EXPORT_SYMBOL_GPL(irq_free_descs);
691
692/**
693 * irq_alloc_descs - allocate and initialize a range of irq descriptors
694 * @irq: Allocate for specific irq number if irq >= 0
695 * @from: Start the search from this irq number
696 * @cnt: Number of consecutive irqs to allocate.
697 * @node: Preferred node on which the irq descriptor should be allocated
698 * @owner: Owning module (can be NULL)
699 * @affinity: Optional pointer to an affinity mask array of size @cnt which
700 * hints where the irq descriptors should be allocated and which
701 * default affinities to use
702 *
703 * Returns the first irq number or error code
704 */
705int __ref
706__irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
707 struct module *owner, const struct cpumask *affinity)
708{
709 int start, ret;
710
711 if (!cnt)
712 return -EINVAL;
713
714 if (irq >= 0) {
715 if (from > irq)
716 return -EINVAL;
717 from = irq;
718 } else {
719 /*
720 * For interrupts which are freely allocated the
721 * architecture can force a lower bound to the @from
722 * argument. x86 uses this to exclude the GSI space.
723 */
724 from = arch_dynirq_lower_bound(from);
725 }
726
727 mutex_lock(&sparse_irq_lock);
728
729 start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
730 from, cnt, 0);
731 ret = -EEXIST;
732 if (irq >=0 && start != irq)
733 goto unlock;
734
735 if (start + cnt > nr_irqs) {
736 ret = irq_expand_nr_irqs(start + cnt);
737 if (ret)
738 goto unlock;
739 }
740 ret = alloc_descs(start, cnt, node, affinity, owner);
741unlock:
742 mutex_unlock(&sparse_irq_lock);
743 return ret;
744}
745EXPORT_SYMBOL_GPL(__irq_alloc_descs);
746
747#ifdef CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
748/**
749 * irq_alloc_hwirqs - Allocate an irq descriptor and initialize the hardware
750 * @cnt: number of interrupts to allocate
751 * @node: node on which to allocate
752 *
753 * Returns an interrupt number > 0 or 0, if the allocation fails.
754 */
755unsigned int irq_alloc_hwirqs(int cnt, int node)
756{
757 int i, irq = __irq_alloc_descs(-1, 0, cnt, node, NULL, NULL);
758
759 if (irq < 0)
760 return 0;
761
762 for (i = irq; cnt > 0; i++, cnt--) {
763 if (arch_setup_hwirq(i, node))
764 goto err;
765 irq_clear_status_flags(i, _IRQ_NOREQUEST);
766 }
767 return irq;
768
769err:
770 for (i--; i >= irq; i--) {
771 irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
772 arch_teardown_hwirq(i);
773 }
774 irq_free_descs(irq, cnt);
775 return 0;
776}
777EXPORT_SYMBOL_GPL(irq_alloc_hwirqs);
778
779/**
780 * irq_free_hwirqs - Free irq descriptor and cleanup the hardware
781 * @from: Free from irq number
782 * @cnt: number of interrupts to free
783 *
784 */
785void irq_free_hwirqs(unsigned int from, int cnt)
786{
787 int i, j;
788
789 for (i = from, j = cnt; j > 0; i++, j--) {
790 irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
791 arch_teardown_hwirq(i);
792 }
793 irq_free_descs(from, cnt);
794}
795EXPORT_SYMBOL_GPL(irq_free_hwirqs);
796#endif
797
798/**
799 * irq_get_next_irq - get next allocated irq number
800 * @offset: where to start the search
801 *
802 * Returns next irq number after offset or nr_irqs if none is found.
803 */
804unsigned int irq_get_next_irq(unsigned int offset)
805{
806 return find_next_bit(allocated_irqs, nr_irqs, offset);
807}
808
809struct irq_desc *
810__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
811 unsigned int check)
812{
813 struct irq_desc *desc = irq_to_desc(irq);
814
815 if (desc) {
816 if (check & _IRQ_DESC_CHECK) {
817 if ((check & _IRQ_DESC_PERCPU) &&
818 !irq_settings_is_per_cpu_devid(desc))
819 return NULL;
820
821 if (!(check & _IRQ_DESC_PERCPU) &&
822 irq_settings_is_per_cpu_devid(desc))
823 return NULL;
824 }
825
826 if (bus)
827 chip_bus_lock(desc);
828 raw_spin_lock_irqsave(&desc->lock, *flags);
829 }
830 return desc;
831}
832
833void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
834{
835 raw_spin_unlock_irqrestore(&desc->lock, flags);
836 if (bus)
837 chip_bus_sync_unlock(desc);
838}
839
840int irq_set_percpu_devid_partition(unsigned int irq,
841 const struct cpumask *affinity)
842{
843 struct irq_desc *desc = irq_to_desc(irq);
844
845 if (!desc)
846 return -EINVAL;
847
848 if (desc->percpu_enabled)
849 return -EINVAL;
850
851 desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
852
853 if (!desc->percpu_enabled)
854 return -ENOMEM;
855
856 if (affinity)
857 desc->percpu_affinity = affinity;
858 else
859 desc->percpu_affinity = cpu_possible_mask;
860
861 irq_set_percpu_devid_flags(irq);
862 return 0;
863}
864
865int irq_set_percpu_devid(unsigned int irq)
866{
867 return irq_set_percpu_devid_partition(irq, NULL);
868}
869
870int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
871{
872 struct irq_desc *desc = irq_to_desc(irq);
873
874 if (!desc || !desc->percpu_enabled)
875 return -EINVAL;
876
877 if (affinity)
878 cpumask_copy(affinity, desc->percpu_affinity);
879
880 return 0;
881}
882EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
883
884void kstat_incr_irq_this_cpu(unsigned int irq)
885{
886 kstat_incr_irqs_this_cpu(irq_to_desc(irq));
887}
888
889/**
890 * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
891 * @irq: The interrupt number
892 * @cpu: The cpu number
893 *
894 * Returns the sum of interrupt counts on @cpu since boot for
895 * @irq. The caller must ensure that the interrupt is not removed
896 * concurrently.
897 */
898unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
899{
900 struct irq_desc *desc = irq_to_desc(irq);
901
902 return desc && desc->kstat_irqs ?
903 *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
904}
905
906/**
907 * kstat_irqs - Get the statistics for an interrupt
908 * @irq: The interrupt number
909 *
910 * Returns the sum of interrupt counts on all cpus since boot for
911 * @irq. The caller must ensure that the interrupt is not removed
912 * concurrently.
913 */
914unsigned int kstat_irqs(unsigned int irq)
915{
916 struct irq_desc *desc = irq_to_desc(irq);
917 int cpu;
918 unsigned int sum = 0;
919
920 if (!desc || !desc->kstat_irqs)
921 return 0;
922 for_each_possible_cpu(cpu)
923 sum += *per_cpu_ptr(desc->kstat_irqs, cpu);
924 return sum;
925}
926
927/**
928 * kstat_irqs_usr - Get the statistics for an interrupt
929 * @irq: The interrupt number
930 *
931 * Returns the sum of interrupt counts on all cpus since boot for
932 * @irq. Contrary to kstat_irqs() this can be called from any
933 * preemptible context. It's protected against concurrent removal of
934 * an interrupt descriptor when sparse irqs are enabled.
935 */
936unsigned int kstat_irqs_usr(unsigned int irq)
937{
938 unsigned int sum;
939
940 irq_lock_sparse();
941 sum = kstat_irqs(irq);
942 irq_unlock_sparse();
943 return sum;
944}