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Thomas Gleixner52a65ff2018-03-14 22:15:19 +01001// SPDX-License-Identifier: GPL-2.0
Thomas Gleixner3795de22010-09-22 17:09:43 +02002/*
3 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
5 *
Thomas Gleixner99bfce52018-03-14 22:15:16 +01006 * This file contains the interrupt descriptor management code. Detailed
7 * information is available in Documentation/core-api/genericirq.rst
Thomas Gleixner3795de22010-09-22 17:09:43 +02008 *
9 */
10#include <linux/irq.h>
11#include <linux/slab.h>
Paul Gortmakerec53cf22011-09-19 20:33:19 -040012#include <linux/export.h>
Thomas Gleixner3795de22010-09-22 17:09:43 +020013#include <linux/interrupt.h>
14#include <linux/kernel_stat.h>
15#include <linux/radix-tree.h>
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020016#include <linux/bitmap.h>
Marc Zyngier76ba59f2014-08-26 11:03:16 +010017#include <linux/irqdomain.h>
Craig Gallekecb3f392016-09-13 12:14:51 -040018#include <linux/sysfs.h>
Thomas Gleixner3795de22010-09-22 17:09:43 +020019
20#include "internals.h"
21
22/*
23 * lockdep: we want to handle all irq_desc locks as a single lock-class:
24 */
Thomas Gleixner78f90d92010-09-29 17:18:47 +020025static struct lock_class_key irq_desc_lock_class;
Thomas Gleixner3795de22010-09-22 17:09:43 +020026
Thomas Gleixnerfe051432011-05-18 12:53:03 +020027#if defined(CONFIG_SMP)
Thomas Gleixnerfbf19802016-02-03 19:52:23 +010028static int __init irq_affinity_setup(char *str)
29{
Rakib Mullick10d94ff2017-11-01 10:14:51 +060030 alloc_bootmem_cpumask_var(&irq_default_affinity);
Thomas Gleixnerfbf19802016-02-03 19:52:23 +010031 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
Thomas Gleixner3795de22010-09-22 17:09:43 +020041static void __init init_irq_default_affinity(void)
42{
Rakib Mullick10d94ff2017-11-01 10:14:51 +060043 if (!cpumask_available(irq_default_affinity))
Thomas Gleixnerfbf19802016-02-03 19:52:23 +010044 zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
Thomas Gleixnerfbf19802016-02-03 19:52:23 +010045 if (cpumask_empty(irq_default_affinity))
46 cpumask_setall(irq_default_affinity);
Thomas Gleixner3795de22010-09-22 17:09:43 +020047}
48#else
49static void __init init_irq_default_affinity(void)
50{
51}
52#endif
53
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020054#ifdef CONFIG_SMP
Thomas Gleixner4ab764c2017-06-20 01:37:36 +020055static int alloc_masks(struct irq_desc *desc, int node)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020056{
Jiang Liu9df872f2015-06-03 11:47:50 +080057 if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity,
Thomas Gleixner4ab764c2017-06-20 01:37:36 +020058 GFP_KERNEL, node))
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020059 return -ENOMEM;
60
Thomas Gleixner0d3f5422017-06-20 01:37:38 +020061#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
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020069#ifdef CONFIG_GENERIC_PENDING_IRQ
Thomas Gleixner4ab764c2017-06-20 01:37:36 +020070 if (!zalloc_cpumask_var_node(&desc->pending_mask, GFP_KERNEL, node)) {
Thomas Gleixner0d3f5422017-06-20 01:37:38 +020071#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
72 free_cpumask_var(desc->irq_common_data.effective_affinity);
73#endif
Jiang Liu9df872f2015-06-03 11:47:50 +080074 free_cpumask_var(desc->irq_common_data.affinity);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020075 return -ENOMEM;
76 }
77#endif
78 return 0;
79}
80
Thomas Gleixner45ddcec2016-07-04 17:39:25 +090081static void desc_smp_init(struct irq_desc *desc, int node,
82 const struct cpumask *affinity)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020083{
Thomas Gleixner45ddcec2016-07-04 17:39:25 +090084 if (!affinity)
85 affinity = irq_default_affinity;
86 cpumask_copy(desc->irq_common_data.affinity, affinity);
87
Thomas Gleixnerb7b29332010-09-29 18:46:55 +020088#ifdef CONFIG_GENERIC_PENDING_IRQ
89 cpumask_clear(desc->pending_mask);
90#endif
Jiang Liu449e9ca2015-06-01 16:05:16 +080091#ifdef CONFIG_NUMA
92 desc->irq_common_data.node = node;
93#endif
Thomas Gleixnerb7b29332010-09-29 18:46:55 +020094}
95
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020096#else
97static inline int
Thomas Gleixner4ab764c2017-06-20 01:37:36 +020098alloc_masks(struct irq_desc *desc, int node) { return 0; }
Thomas Gleixner45ddcec2016-07-04 17:39:25 +090099static inline void
100desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { }
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200101#endif
102
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200103static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900104 const struct cpumask *affinity, struct module *owner)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200105{
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800106 int cpu;
107
Jiang Liuaf7080e2015-06-01 16:05:21 +0800108 desc->irq_common_data.handler_data = NULL;
Jiang Liub2377212015-06-01 16:05:43 +0800109 desc->irq_common_data.msi_desc = NULL;
Jiang Liuaf7080e2015-06-01 16:05:21 +0800110
Jiang Liu0d0b4c82015-06-01 16:05:12 +0800111 desc->irq_data.common = &desc->irq_common_data;
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200112 desc->irq_data.irq = irq;
113 desc->irq_data.chip = &no_irq_chip;
114 desc->irq_data.chip_data = NULL;
Thomas Gleixnerf9e49892011-02-09 14:54:49 +0100115 irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
Thomas Gleixner801a0e92011-03-27 11:02:49 +0200116 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
Jeffy Chend829b8f2017-06-26 19:33:33 +0800117 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200118 desc->handle_irq = handle_bad_irq;
119 desc->depth = 1;
Thomas Gleixnerb7b29332010-09-29 18:46:55 +0200120 desc->irq_count = 0;
121 desc->irqs_unhandled = 0;
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200122 desc->name = NULL;
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200123 desc->owner = owner;
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800124 for_each_possible_cpu(cpu)
125 *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900126 desc_smp_init(desc, node, affinity);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200127}
128
Thomas Gleixner3795de22010-09-22 17:09:43 +0200129int nr_irqs = NR_IRQS;
130EXPORT_SYMBOL_GPL(nr_irqs);
131
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200132static DEFINE_MUTEX(sparse_irq_lock);
Thomas Gleixnerc1ee6262011-02-17 17:45:15 +0100133static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200134
Thomas Gleixner3795de22010-09-22 17:09:43 +0200135#ifdef CONFIG_SPARSE_IRQ
136
Craig Gallekecb3f392016-09-13 12:14:51 -0400137static 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
Andy Shevchenkod61e2942018-02-26 17:50:43 +0200213static 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
Craig Gallekecb3f392016-09-13 12:14:51 -0400229static 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,
Andy Shevchenkod61e2942018-02-26 17:50:43 +0200272 &wakeup_attr.attr,
Craig Gallekecb3f392016-09-13 12:14:51 -0400273 &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
Thomas Gleixnerbaa0d232010-10-05 15:14:35 +0200329static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200330
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200331static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
Thomas Gleixner3795de22010-09-22 17:09:43 +0200332{
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}
Jiri Kosina3911ff32012-05-13 12:13:15 +0200340EXPORT_SYMBOL(irq_to_desc);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200341
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200342static 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
Jiang Liu9df872f2015-06-03 11:47:50 +0800353 free_cpumask_var(desc->irq_common_data.affinity);
Thomas Gleixner0d3f5422017-06-20 01:37:38 +0200354#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
355 free_cpumask_var(desc->irq_common_data.effective_affinity);
356#endif
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200357}
358#else
359static inline void free_masks(struct irq_desc *desc) { }
360#endif
361
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100362void 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
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900372static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
373 const struct cpumask *affinity,
374 struct module *owner)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200375{
376 struct irq_desc *desc;
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200377
Thomas Gleixner4ab764c2017-06-20 01:37:36 +0200378 desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200379 if (!desc)
380 return NULL;
381 /* allocate based on nr_cpu_ids */
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800382 desc->kstat_irqs = alloc_percpu(unsigned int);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200383 if (!desc->kstat_irqs)
384 goto err_desc;
385
Thomas Gleixner4ab764c2017-06-20 01:37:36 +0200386 if (alloc_masks(desc, node))
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200387 goto err_kstat;
388
389 raw_spin_lock_init(&desc->lock);
390 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
Thomas Gleixner91140142017-06-29 23:33:37 +0200391 mutex_init(&desc->request_mutex);
Thomas Gleixner425a50722015-12-13 18:02:22 +0100392 init_rcu_head(&desc->rcu);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200393
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900394 desc_set_defaults(irq, desc, node, affinity, owner);
395 irqd_set(&desc->irq_data, flags);
Craig Gallekecb3f392016-09-13 12:14:51 -0400396 kobject_init(&desc->kobj, &irq_kobj_type);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200397
398 return desc;
399
400err_kstat:
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800401 free_percpu(desc->kstat_irqs);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200402err_desc:
403 kfree(desc);
404 return NULL;
405}
406
Craig Gallekecb3f392016-09-13 12:14:51 -0400407static void irq_kobj_release(struct kobject *kobj)
Thomas Gleixner425a50722015-12-13 18:02:22 +0100408{
Craig Gallekecb3f392016-09-13 12:14:51 -0400409 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
Thomas Gleixner425a50722015-12-13 18:02:22 +0100410
411 free_masks(desc);
412 free_percpu(desc->kstat_irqs);
413 kfree(desc);
414}
415
Craig Gallekecb3f392016-09-13 12:14:51 -0400416static 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
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200423static void free_desc(unsigned int irq)
424{
425 struct irq_desc *desc = irq_to_desc(irq);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200426
Thomas Gleixner087cdfb2017-06-20 01:37:17 +0200427 irq_remove_debugfs_entry(desc);
Thomas Gleixner13bfe992010-09-30 02:46:07 +0200428 unregister_irq_proc(irq, desc);
429
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100430 /*
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.
Craig Gallekecb3f392016-09-13 12:14:51 -0400435 *
436 * The sysfs entry must be serialized against a concurrent
437 * irq_sysfs_init() as well.
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100438 */
Craig Gallekecb3f392016-09-13 12:14:51 -0400439 kobject_del(&desc->kobj);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200440 delete_irq_desc(irq);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200441
Thomas Gleixner425a50722015-12-13 18:02:22 +0100442 /*
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.
Eric Dumazet4a5f4d22018-06-18 05:56:12 -0700446 * This also allows us to use rcu in kstat_irqs_usr().
Thomas Gleixner425a50722015-12-13 18:02:22 +0100447 */
448 call_rcu(&desc->rcu, delayed_free_desc);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200449}
450
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200451static int alloc_descs(unsigned int start, unsigned int cnt, int node,
Dou Liyangbec04032018-12-04 23:51:20 +0800452 const struct irq_affinity_desc *affinity,
453 struct module *owner)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200454{
455 struct irq_desc *desc;
Thomas Gleixnere75eafb2016-09-14 16:18:49 +0200456 int i;
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900457
Thomas Gleixnere75eafb2016-09-14 16:18:49 +0200458 /* Validate affinity mask(s) */
459 if (affinity) {
Huacai Chen12fee4c2019-01-17 11:00:09 +0800460 for (i = 0; i < cnt; i++) {
Dou Liyangbec04032018-12-04 23:51:20 +0800461 if (cpumask_empty(&affinity[i].mask))
Thomas Gleixnere75eafb2016-09-14 16:18:49 +0200462 return -EINVAL;
463 }
464 }
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900465
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200466 for (i = 0; i < cnt; i++) {
Dou Liyangbec04032018-12-04 23:51:20 +0800467 const struct cpumask *mask = NULL;
Dou Liyangc410abbb2018-12-04 23:51:21 +0800468 unsigned int flags = 0;
Dou Liyangbec04032018-12-04 23:51:20 +0800469
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900470 if (affinity) {
Dou Liyangc410abbb2018-12-04 23:51:21 +0800471 if (affinity->is_managed) {
472 flags = IRQD_AFFINITY_MANAGED |
473 IRQD_MANAGED_SHUTDOWN;
474 }
Dou Liyangbec04032018-12-04 23:51:20 +0800475 mask = &affinity->mask;
Dou Liyangc410abbb2018-12-04 23:51:21 +0800476 node = cpu_to_node(cpumask_first(mask));
Thomas Gleixnere75eafb2016-09-14 16:18:49 +0200477 affinity++;
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900478 }
Dou Liyangc410abbb2018-12-04 23:51:21 +0800479
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900480 desc = alloc_desc(start + i, node, flags, mask, owner);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200481 if (!desc)
482 goto err;
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200483 irq_insert_desc(start + i, desc);
Craig Gallekecb3f392016-09-13 12:14:51 -0400484 irq_sysfs_add(start + i, desc);
Thomas Gleixnere0b47792017-09-13 23:29:04 +0200485 irq_add_debugfs_entry(start + i, desc);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200486 }
Thomas Gleixner12ac1d02017-09-05 10:12:20 +0200487 bitmap_set(allocated_irqs, start, cnt);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200488 return start;
489
490err:
491 for (i--; i >= 0; i--)
492 free_desc(start + i);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200493 return -ENOMEM;
494}
495
Yinghai Lued4dea62011-02-19 11:07:37 -0800496static int irq_expand_nr_irqs(unsigned int nr)
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100497{
Yinghai Lued4dea62011-02-19 11:07:37 -0800498 if (nr > IRQ_BITMAP_BITS)
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100499 return -ENOMEM;
Yinghai Lued4dea62011-02-19 11:07:37 -0800500 nr_irqs = nr;
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100501 return 0;
502}
503
Thomas Gleixner3795de22010-09-22 17:09:43 +0200504int __init early_irq_init(void)
505{
Thomas Gleixnerb683de22010-09-27 20:55:03 +0200506 int i, initcnt, node = first_online_node;
Thomas Gleixner3795de22010-09-22 17:09:43 +0200507 struct irq_desc *desc;
Thomas Gleixner3795de22010-09-22 17:09:43 +0200508
509 init_irq_default_affinity();
510
Thomas Gleixnerb683de22010-09-27 20:55:03 +0200511 /* Let arch update nr_irqs and return the nr of preallocated irqs */
512 initcnt = arch_probe_nr_irqs();
Vincent Legoll5a29ef22017-05-09 10:34:09 +0200513 printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n",
514 NR_IRQS, nr_irqs, initcnt);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200515
Thomas Gleixnerc1ee6262011-02-17 17:45:15 +0100516 if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
517 nr_irqs = IRQ_BITMAP_BITS;
518
519 if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
520 initcnt = IRQ_BITMAP_BITS;
521
522 if (initcnt > nr_irqs)
523 nr_irqs = initcnt;
524
Thomas Gleixnerb683de22010-09-27 20:55:03 +0200525 for (i = 0; i < initcnt; i++) {
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900526 desc = alloc_desc(i, node, 0, NULL, NULL);
Thomas Gleixneraa99ec02010-09-27 20:02:56 +0200527 set_bit(i, allocated_irqs);
528 irq_insert_desc(i, desc);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200529 }
Thomas Gleixner3795de22010-09-22 17:09:43 +0200530 return arch_early_irq_init();
531}
532
Thomas Gleixner3795de22010-09-22 17:09:43 +0200533#else /* !CONFIG_SPARSE_IRQ */
534
535struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
536 [0 ... NR_IRQS-1] = {
Thomas Gleixner3795de22010-09-22 17:09:43 +0200537 .handle_irq = handle_bad_irq,
538 .depth = 1,
539 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
540 }
541};
542
Thomas Gleixner3795de22010-09-22 17:09:43 +0200543int __init early_irq_init(void)
544{
Thomas Gleixneraa99ec02010-09-27 20:02:56 +0200545 int count, i, node = first_online_node;
Thomas Gleixner3795de22010-09-22 17:09:43 +0200546 struct irq_desc *desc;
Thomas Gleixner3795de22010-09-22 17:09:43 +0200547
548 init_irq_default_affinity();
549
Vincent Legoll5a29ef22017-05-09 10:34:09 +0200550 printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200551
552 desc = irq_desc;
553 count = ARRAY_SIZE(irq_desc);
554
555 for (i = 0; i < count; i++) {
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800556 desc[i].kstat_irqs = alloc_percpu(unsigned int);
Thomas Gleixner4ab764c2017-06-20 01:37:36 +0200557 alloc_masks(&desc[i], node);
Linus Walleije7fbad32011-05-31 18:14:39 +0200558 raw_spin_lock_init(&desc[i].lock);
Thomas Gleixner154cd382010-09-22 15:58:45 +0200559 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900560 desc_set_defaults(i, &desc[i], node, NULL, NULL);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200561 }
562 return arch_early_irq_init();
563}
564
565struct irq_desc *irq_to_desc(unsigned int irq)
566{
567 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
568}
Paul Gortmaker2c45aad2014-02-10 13:39:53 -0500569EXPORT_SYMBOL(irq_to_desc);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200570
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200571static void free_desc(unsigned int irq)
572{
Thomas Gleixnerd8179bc2014-05-07 15:44:23 +0000573 struct irq_desc *desc = irq_to_desc(irq);
574 unsigned long flags;
575
576 raw_spin_lock_irqsave(&desc->lock, flags);
Thomas Gleixner45ddcec2016-07-04 17:39:25 +0900577 desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
Thomas Gleixnerd8179bc2014-05-07 15:44:23 +0000578 raw_spin_unlock_irqrestore(&desc->lock, flags);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200579}
580
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200581static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
Dou Liyangbec04032018-12-04 23:51:20 +0800582 const struct irq_affinity_desc *affinity,
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200583 struct module *owner)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200584{
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200585 u32 i;
586
587 for (i = 0; i < cnt; i++) {
588 struct irq_desc *desc = irq_to_desc(start + i);
589
590 desc->owner = owner;
591 }
Thomas Gleixner12ac1d02017-09-05 10:12:20 +0200592 bitmap_set(allocated_irqs, start, cnt);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200593 return start;
594}
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100595
Yinghai Lued4dea62011-02-19 11:07:37 -0800596static int irq_expand_nr_irqs(unsigned int nr)
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100597{
598 return -ENOMEM;
599}
600
Thomas Gleixnerf63b6a02014-05-07 15:44:21 +0000601void irq_mark_irq(unsigned int irq)
602{
603 mutex_lock(&sparse_irq_lock);
604 bitmap_set(allocated_irqs, irq, 1);
605 mutex_unlock(&sparse_irq_lock);
606}
607
Thomas Gleixnerc940e012014-05-07 15:44:22 +0000608#ifdef CONFIG_GENERIC_IRQ_LEGACY
609void irq_init_desc(unsigned int irq)
610{
Thomas Gleixnerd8179bc2014-05-07 15:44:23 +0000611 free_desc(irq);
Thomas Gleixnerc940e012014-05-07 15:44:22 +0000612}
613#endif
614
Thomas Gleixner3795de22010-09-22 17:09:43 +0200615#endif /* !CONFIG_SPARSE_IRQ */
616
Thomas Gleixnerfe12bc22011-05-18 12:48:00 +0200617/**
618 * generic_handle_irq - Invoke the handler for a particular irq
619 * @irq: The irq number to handle
620 *
621 */
622int generic_handle_irq(unsigned int irq)
623{
624 struct irq_desc *desc = irq_to_desc(irq);
625
626 if (!desc)
627 return -EINVAL;
Thomas Gleixnerbd0b9ac2015-09-14 10:42:37 +0200628 generic_handle_irq_desc(desc);
Thomas Gleixnerfe12bc22011-05-18 12:48:00 +0200629 return 0;
630}
Jonathan Cameronedf76f82011-05-18 10:39:04 +0100631EXPORT_SYMBOL_GPL(generic_handle_irq);
Thomas Gleixnerfe12bc22011-05-18 12:48:00 +0200632
Marc Zyngier76ba59f2014-08-26 11:03:16 +0100633#ifdef CONFIG_HANDLE_DOMAIN_IRQ
634/**
635 * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain
636 * @domain: The domain where to perform the lookup
637 * @hwirq: The HW irq number to convert to a logical one
638 * @lookup: Whether to perform the domain lookup or not
639 * @regs: Register file coming from the low-level handling code
640 *
641 * Returns: 0 on success, or -EINVAL if conversion has failed
642 */
643int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
644 bool lookup, struct pt_regs *regs)
645{
646 struct pt_regs *old_regs = set_irq_regs(regs);
647 unsigned int irq = hwirq;
648 int ret = 0;
649
650 irq_enter();
651
652#ifdef CONFIG_IRQ_DOMAIN
653 if (lookup)
654 irq = irq_find_mapping(domain, hwirq);
655#endif
656
657 /*
658 * Some hardware gives randomly wrong interrupts. Rather
659 * than crashing, do something sensible.
660 */
661 if (unlikely(!irq || irq >= nr_irqs)) {
662 ack_bad_irq(irq);
663 ret = -EINVAL;
664 } else {
665 generic_handle_irq(irq);
666 }
667
668 irq_exit();
669 set_irq_regs(old_regs);
670 return ret;
671}
672#endif
673
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200674/* Dynamic interrupt handling */
675
676/**
677 * irq_free_descs - free irq descriptors
678 * @from: Start of descriptor range
679 * @cnt: Number of consecutive irqs to free
680 */
681void irq_free_descs(unsigned int from, unsigned int cnt)
682{
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200683 int i;
684
685 if (from >= nr_irqs || (from + cnt) > nr_irqs)
686 return;
687
Thomas Gleixner12ac1d02017-09-05 10:12:20 +0200688 mutex_lock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200689 for (i = 0; i < cnt; i++)
690 free_desc(from + i);
691
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200692 bitmap_clear(allocated_irqs, from, cnt);
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200693 mutex_unlock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200694}
Jonathan Cameronedf76f82011-05-18 10:39:04 +0100695EXPORT_SYMBOL_GPL(irq_free_descs);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200696
697/**
698 * irq_alloc_descs - allocate and initialize a range of irq descriptors
699 * @irq: Allocate for specific irq number if irq >= 0
700 * @from: Start the search from this irq number
701 * @cnt: Number of consecutive irqs to allocate.
702 * @node: Preferred node on which the irq descriptor should be allocated
Randy Dunlapd522a0d2011-08-18 12:19:27 -0700703 * @owner: Owning module (can be NULL)
Thomas Gleixnere75eafb2016-09-14 16:18:49 +0200704 * @affinity: Optional pointer to an affinity mask array of size @cnt which
705 * hints where the irq descriptors should be allocated and which
706 * default affinities to use
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200707 *
708 * Returns the first irq number or error code
709 */
710int __ref
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200711__irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
Dou Liyangbec04032018-12-04 23:51:20 +0800712 struct module *owner, const struct irq_affinity_desc *affinity)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200713{
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200714 int start, ret;
715
716 if (!cnt)
717 return -EINVAL;
718
Mark Brownc5182b82011-06-02 18:55:13 +0100719 if (irq >= 0) {
720 if (from > irq)
721 return -EINVAL;
722 from = irq;
Thomas Gleixner62a08ae2014-04-24 09:50:53 +0200723 } else {
724 /*
725 * For interrupts which are freely allocated the
726 * architecture can force a lower bound to the @from
727 * argument. x86 uses this to exclude the GSI space.
728 */
729 from = arch_dynirq_lower_bound(from);
Mark Brownc5182b82011-06-02 18:55:13 +0100730 }
731
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200732 mutex_lock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200733
Yinghai Lued4dea62011-02-19 11:07:37 -0800734 start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
735 from, cnt, 0);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200736 ret = -EEXIST;
737 if (irq >=0 && start != irq)
Thomas Gleixner12ac1d02017-09-05 10:12:20 +0200738 goto unlock;
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200739
Yinghai Lued4dea62011-02-19 11:07:37 -0800740 if (start + cnt > nr_irqs) {
741 ret = irq_expand_nr_irqs(start + cnt);
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100742 if (ret)
Thomas Gleixner12ac1d02017-09-05 10:12:20 +0200743 goto unlock;
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100744 }
Thomas Gleixner12ac1d02017-09-05 10:12:20 +0200745 ret = alloc_descs(start, cnt, node, affinity, owner);
746unlock:
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200747 mutex_unlock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200748 return ret;
749}
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200750EXPORT_SYMBOL_GPL(__irq_alloc_descs);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200751
Thomas Gleixner7b6ef122014-05-07 15:44:05 +0000752#ifdef CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
753/**
754 * irq_alloc_hwirqs - Allocate an irq descriptor and initialize the hardware
755 * @cnt: number of interrupts to allocate
756 * @node: node on which to allocate
757 *
758 * Returns an interrupt number > 0 or 0, if the allocation fails.
759 */
760unsigned int irq_alloc_hwirqs(int cnt, int node)
761{
Thomas Gleixner06ee6d52016-07-04 17:39:24 +0900762 int i, irq = __irq_alloc_descs(-1, 0, cnt, node, NULL, NULL);
Thomas Gleixner7b6ef122014-05-07 15:44:05 +0000763
764 if (irq < 0)
765 return 0;
766
767 for (i = irq; cnt > 0; i++, cnt--) {
768 if (arch_setup_hwirq(i, node))
769 goto err;
770 irq_clear_status_flags(i, _IRQ_NOREQUEST);
771 }
772 return irq;
773
774err:
775 for (i--; i >= irq; i--) {
776 irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
777 arch_teardown_hwirq(i);
778 }
779 irq_free_descs(irq, cnt);
780 return 0;
781}
782EXPORT_SYMBOL_GPL(irq_alloc_hwirqs);
783
784/**
785 * irq_free_hwirqs - Free irq descriptor and cleanup the hardware
786 * @from: Free from irq number
787 * @cnt: number of interrupts to free
788 *
789 */
790void irq_free_hwirqs(unsigned int from, int cnt)
791{
Keith Busch8844aad2014-06-30 16:24:44 -0600792 int i, j;
Thomas Gleixner7b6ef122014-05-07 15:44:05 +0000793
Keith Busch8844aad2014-06-30 16:24:44 -0600794 for (i = from, j = cnt; j > 0; i++, j--) {
Thomas Gleixner7b6ef122014-05-07 15:44:05 +0000795 irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
796 arch_teardown_hwirq(i);
797 }
798 irq_free_descs(from, cnt);
799}
800EXPORT_SYMBOL_GPL(irq_free_hwirqs);
801#endif
802
Thomas Gleixnera98d24b712010-09-30 10:45:07 +0200803/**
804 * irq_get_next_irq - get next allocated irq number
805 * @offset: where to start the search
806 *
807 * Returns next irq number after offset or nr_irqs if none is found.
808 */
809unsigned int irq_get_next_irq(unsigned int offset)
810{
811 return find_next_bit(allocated_irqs, nr_irqs, offset);
812}
813
Thomas Gleixnerd5eb4ad22011-02-12 12:16:16 +0100814struct irq_desc *
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100815__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
816 unsigned int check)
Thomas Gleixnerd5eb4ad22011-02-12 12:16:16 +0100817{
818 struct irq_desc *desc = irq_to_desc(irq);
819
820 if (desc) {
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100821 if (check & _IRQ_DESC_CHECK) {
822 if ((check & _IRQ_DESC_PERCPU) &&
823 !irq_settings_is_per_cpu_devid(desc))
824 return NULL;
825
826 if (!(check & _IRQ_DESC_PERCPU) &&
827 irq_settings_is_per_cpu_devid(desc))
828 return NULL;
829 }
830
Thomas Gleixnerd5eb4ad22011-02-12 12:16:16 +0100831 if (bus)
832 chip_bus_lock(desc);
833 raw_spin_lock_irqsave(&desc->lock, *flags);
834 }
835 return desc;
836}
837
838void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
839{
840 raw_spin_unlock_irqrestore(&desc->lock, flags);
841 if (bus)
842 chip_bus_sync_unlock(desc);
843}
844
Marc Zyngier222df542016-04-11 09:57:52 +0100845int irq_set_percpu_devid_partition(unsigned int irq,
846 const struct cpumask *affinity)
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100847{
848 struct irq_desc *desc = irq_to_desc(irq);
849
850 if (!desc)
851 return -EINVAL;
852
853 if (desc->percpu_enabled)
854 return -EINVAL;
855
856 desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
857
858 if (!desc->percpu_enabled)
859 return -ENOMEM;
860
Marc Zyngier222df542016-04-11 09:57:52 +0100861 if (affinity)
862 desc->percpu_affinity = affinity;
863 else
864 desc->percpu_affinity = cpu_possible_mask;
865
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100866 irq_set_percpu_devid_flags(irq);
867 return 0;
868}
869
Marc Zyngier222df542016-04-11 09:57:52 +0100870int irq_set_percpu_devid(unsigned int irq)
871{
872 return irq_set_percpu_devid_partition(irq, NULL);
873}
874
875int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
876{
877 struct irq_desc *desc = irq_to_desc(irq);
878
879 if (!desc || !desc->percpu_enabled)
880 return -EINVAL;
881
882 if (affinity)
883 cpumask_copy(affinity, desc->percpu_affinity);
884
885 return 0;
886}
Will Deacon5ffeb052016-07-25 16:07:10 +0100887EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
Marc Zyngier222df542016-04-11 09:57:52 +0100888
Thomas Gleixner792d0012014-02-23 21:40:14 +0000889void kstat_incr_irq_this_cpu(unsigned int irq)
890{
Jiang Liub51bf952015-06-04 12:13:25 +0800891 kstat_incr_irqs_this_cpu(irq_to_desc(irq));
Thomas Gleixner792d0012014-02-23 21:40:14 +0000892}
893
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100894/**
895 * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
896 * @irq: The interrupt number
897 * @cpu: The cpu number
898 *
899 * Returns the sum of interrupt counts on @cpu since boot for
900 * @irq. The caller must ensure that the interrupt is not removed
901 * concurrently.
902 */
Thomas Gleixner3795de22010-09-22 17:09:43 +0200903unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
904{
905 struct irq_desc *desc = irq_to_desc(irq);
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800906
907 return desc && desc->kstat_irqs ?
908 *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
Thomas Gleixner3795de22010-09-22 17:09:43 +0200909}
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700910
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100911/**
912 * kstat_irqs - Get the statistics for an interrupt
913 * @irq: The interrupt number
914 *
915 * Returns the sum of interrupt counts on all cpus since boot for
916 * @irq. The caller must ensure that the interrupt is not removed
917 * concurrently.
918 */
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700919unsigned int kstat_irqs(unsigned int irq)
920{
921 struct irq_desc *desc = irq_to_desc(irq);
922 int cpu;
Nicholas Mc Guire5e9662f2015-05-03 10:48:50 +0200923 unsigned int sum = 0;
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700924
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800925 if (!desc || !desc->kstat_irqs)
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700926 return 0;
927 for_each_possible_cpu(cpu)
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800928 sum += *per_cpu_ptr(desc->kstat_irqs, cpu);
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700929 return sum;
930}
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100931
932/**
933 * kstat_irqs_usr - Get the statistics for an interrupt
934 * @irq: The interrupt number
935 *
Eric Dumazet4a5f4d22018-06-18 05:56:12 -0700936 * Returns the sum of interrupt counts on all cpus since boot for @irq.
937 * Contrary to kstat_irqs() this can be called from any context.
938 * It uses rcu since a concurrent removal of an interrupt descriptor is
939 * observing an rcu grace period before delayed_free_desc()/irq_kobj_release().
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100940 */
941unsigned int kstat_irqs_usr(unsigned int irq)
942{
Nicholas Mc Guire7df0b272015-05-03 10:49:11 +0200943 unsigned int sum;
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100944
Eric Dumazet4a5f4d22018-06-18 05:56:12 -0700945 rcu_read_lock();
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100946 sum = kstat_irqs(irq);
Eric Dumazet4a5f4d22018-06-18 05:56:12 -0700947 rcu_read_unlock();
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100948 return sum;
949}