blob: 239e2ae2c947df31d26def1d26da430d144165e8 [file] [log] [blame]
Thomas Gleixner3795de22010-09-22 17:09:43 +02001/*
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>
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>
Thomas Gleixner3795de22010-09-22 17:09:43 +020018
19#include "internals.h"
20
21/*
22 * lockdep: we want to handle all irq_desc locks as a single lock-class:
23 */
Thomas Gleixner78f90d92010-09-29 17:18:47 +020024static struct lock_class_key irq_desc_lock_class;
Thomas Gleixner3795de22010-09-22 17:09:43 +020025
Thomas Gleixnerfe051432011-05-18 12:53:03 +020026#if defined(CONFIG_SMP)
Thomas Gleixner3795de22010-09-22 17:09:43 +020027static 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
33static void __init init_irq_default_affinity(void)
34{
35}
36#endif
37
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020038#ifdef CONFIG_SMP
39static int alloc_masks(struct irq_desc *desc, gfp_t gfp, int node)
40{
Jiang Liu9df872f2015-06-03 11:47:50 +080041 if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity,
42 gfp, node))
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020043 return -ENOMEM;
44
45#ifdef CONFIG_GENERIC_PENDING_IRQ
46 if (!zalloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
Jiang Liu9df872f2015-06-03 11:47:50 +080047 free_cpumask_var(desc->irq_common_data.affinity);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020048 return -ENOMEM;
49 }
50#endif
51 return 0;
52}
53
54static void desc_smp_init(struct irq_desc *desc, int node)
55{
Jiang Liu9df872f2015-06-03 11:47:50 +080056 cpumask_copy(desc->irq_common_data.affinity, irq_default_affinity);
Thomas Gleixnerb7b29332010-09-29 18:46:55 +020057#ifdef CONFIG_GENERIC_PENDING_IRQ
58 cpumask_clear(desc->pending_mask);
59#endif
Jiang Liu449e9ca2015-06-01 16:05:16 +080060#ifdef CONFIG_NUMA
61 desc->irq_common_data.node = node;
62#endif
Thomas Gleixnerb7b29332010-09-29 18:46:55 +020063}
64
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020065#else
66static inline int
67alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) { return 0; }
68static inline void desc_smp_init(struct irq_desc *desc, int node) { }
69#endif
70
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +020071static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
72 struct module *owner)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020073{
Eric Dumazet6c9ae002011-01-13 15:45:38 -080074 int cpu;
75
Jiang Liuaf7080e2015-06-01 16:05:21 +080076 desc->irq_common_data.handler_data = NULL;
Jiang Liub2377212015-06-01 16:05:43 +080077 desc->irq_common_data.msi_desc = NULL;
Jiang Liuaf7080e2015-06-01 16:05:21 +080078
Jiang Liu0d0b4c82015-06-01 16:05:12 +080079 desc->irq_data.common = &desc->irq_common_data;
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020080 desc->irq_data.irq = irq;
81 desc->irq_data.chip = &no_irq_chip;
82 desc->irq_data.chip_data = NULL;
Thomas Gleixnerf9e49892011-02-09 14:54:49 +010083 irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
Thomas Gleixner801a0e92011-03-27 11:02:49 +020084 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020085 desc->handle_irq = handle_bad_irq;
86 desc->depth = 1;
Thomas Gleixnerb7b29332010-09-29 18:46:55 +020087 desc->irq_count = 0;
88 desc->irqs_unhandled = 0;
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020089 desc->name = NULL;
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +020090 desc->owner = owner;
Eric Dumazet6c9ae002011-01-13 15:45:38 -080091 for_each_possible_cpu(cpu)
92 *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +020093 desc_smp_init(desc, node);
94}
95
Thomas Gleixner3795de22010-09-22 17:09:43 +020096int nr_irqs = NR_IRQS;
97EXPORT_SYMBOL_GPL(nr_irqs);
98
Thomas Gleixnera05a9002010-10-08 12:47:53 +020099static DEFINE_MUTEX(sparse_irq_lock);
Thomas Gleixnerc1ee6262011-02-17 17:45:15 +0100100static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200101
Thomas Gleixner3795de22010-09-22 17:09:43 +0200102#ifdef CONFIG_SPARSE_IRQ
103
Thomas Gleixnerbaa0d232010-10-05 15:14:35 +0200104static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200105
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200106static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
Thomas Gleixner3795de22010-09-22 17:09:43 +0200107{
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}
Jiri Kosina3911ff32012-05-13 12:13:15 +0200115EXPORT_SYMBOL(irq_to_desc);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200116
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200117static 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
Jiang Liu9df872f2015-06-03 11:47:50 +0800128 free_cpumask_var(desc->irq_common_data.affinity);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200129}
130#else
131static inline void free_masks(struct irq_desc *desc) { }
132#endif
133
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100134void irq_lock_sparse(void)
135{
136 mutex_lock(&sparse_irq_lock);
137}
138
139void irq_unlock_sparse(void)
140{
141 mutex_unlock(&sparse_irq_lock);
142}
143
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200144static struct irq_desc *alloc_desc(int irq, int node, struct module *owner)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200145{
146 struct irq_desc *desc;
Thomas Gleixnerbaa0d232010-10-05 15:14:35 +0200147 gfp_t gfp = GFP_KERNEL;
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200148
149 desc = kzalloc_node(sizeof(*desc), gfp, node);
150 if (!desc)
151 return NULL;
152 /* allocate based on nr_cpu_ids */
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800153 desc->kstat_irqs = alloc_percpu(unsigned int);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200154 if (!desc->kstat_irqs)
155 goto err_desc;
156
157 if (alloc_masks(desc, gfp, node))
158 goto err_kstat;
159
160 raw_spin_lock_init(&desc->lock);
161 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
162
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200163 desc_set_defaults(irq, desc, node, owner);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200164
165 return desc;
166
167err_kstat:
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800168 free_percpu(desc->kstat_irqs);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200169err_desc:
170 kfree(desc);
171 return NULL;
172}
173
174static void free_desc(unsigned int irq)
175{
176 struct irq_desc *desc = irq_to_desc(irq);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200177
Thomas Gleixner13bfe992010-09-30 02:46:07 +0200178 unregister_irq_proc(irq, desc);
179
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100180 /*
181 * sparse_irq_lock protects also show_interrupts() and
182 * kstat_irq_usr(). Once we deleted the descriptor from the
183 * sparse tree we can free it. Access in proc will fail to
184 * lookup the descriptor.
185 */
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200186 mutex_lock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200187 delete_irq_desc(irq);
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200188 mutex_unlock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200189
190 free_masks(desc);
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800191 free_percpu(desc->kstat_irqs);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200192 kfree(desc);
193}
194
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200195static int alloc_descs(unsigned int start, unsigned int cnt, int node,
196 struct module *owner)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200197{
198 struct irq_desc *desc;
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200199 int i;
200
201 for (i = 0; i < cnt; i++) {
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200202 desc = alloc_desc(start + i, node, owner);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200203 if (!desc)
204 goto err;
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200205 mutex_lock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200206 irq_insert_desc(start + i, desc);
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200207 mutex_unlock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200208 }
209 return start;
210
211err:
212 for (i--; i >= 0; i--)
213 free_desc(start + i);
214
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200215 mutex_lock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200216 bitmap_clear(allocated_irqs, start, cnt);
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200217 mutex_unlock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200218 return -ENOMEM;
219}
220
Yinghai Lued4dea62011-02-19 11:07:37 -0800221static int irq_expand_nr_irqs(unsigned int nr)
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100222{
Yinghai Lued4dea62011-02-19 11:07:37 -0800223 if (nr > IRQ_BITMAP_BITS)
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100224 return -ENOMEM;
Yinghai Lued4dea62011-02-19 11:07:37 -0800225 nr_irqs = nr;
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100226 return 0;
227}
228
Thomas Gleixner3795de22010-09-22 17:09:43 +0200229int __init early_irq_init(void)
230{
Thomas Gleixnerb683de22010-09-27 20:55:03 +0200231 int i, initcnt, node = first_online_node;
Thomas Gleixner3795de22010-09-22 17:09:43 +0200232 struct irq_desc *desc;
Thomas Gleixner3795de22010-09-22 17:09:43 +0200233
234 init_irq_default_affinity();
235
Thomas Gleixnerb683de22010-09-27 20:55:03 +0200236 /* Let arch update nr_irqs and return the nr of preallocated irqs */
237 initcnt = arch_probe_nr_irqs();
238 printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d %d\n", NR_IRQS, nr_irqs, initcnt);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200239
Thomas Gleixnerc1ee6262011-02-17 17:45:15 +0100240 if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
241 nr_irqs = IRQ_BITMAP_BITS;
242
243 if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
244 initcnt = IRQ_BITMAP_BITS;
245
246 if (initcnt > nr_irqs)
247 nr_irqs = initcnt;
248
Thomas Gleixnerb683de22010-09-27 20:55:03 +0200249 for (i = 0; i < initcnt; i++) {
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200250 desc = alloc_desc(i, node, NULL);
Thomas Gleixneraa99ec02010-09-27 20:02:56 +0200251 set_bit(i, allocated_irqs);
252 irq_insert_desc(i, desc);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200253 }
Thomas Gleixner3795de22010-09-22 17:09:43 +0200254 return arch_early_irq_init();
255}
256
Thomas Gleixner3795de22010-09-22 17:09:43 +0200257#else /* !CONFIG_SPARSE_IRQ */
258
259struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
260 [0 ... NR_IRQS-1] = {
Thomas Gleixner3795de22010-09-22 17:09:43 +0200261 .handle_irq = handle_bad_irq,
262 .depth = 1,
263 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
264 }
265};
266
Thomas Gleixner3795de22010-09-22 17:09:43 +0200267int __init early_irq_init(void)
268{
Thomas Gleixneraa99ec02010-09-27 20:02:56 +0200269 int count, i, node = first_online_node;
Thomas Gleixner3795de22010-09-22 17:09:43 +0200270 struct irq_desc *desc;
Thomas Gleixner3795de22010-09-22 17:09:43 +0200271
272 init_irq_default_affinity();
273
274 printk(KERN_INFO "NR_IRQS:%d\n", NR_IRQS);
275
276 desc = irq_desc;
277 count = ARRAY_SIZE(irq_desc);
278
279 for (i = 0; i < count; i++) {
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800280 desc[i].kstat_irqs = alloc_percpu(unsigned int);
Linus Walleije7fbad32011-05-31 18:14:39 +0200281 alloc_masks(&desc[i], GFP_KERNEL, node);
282 raw_spin_lock_init(&desc[i].lock);
Thomas Gleixner154cd382010-09-22 15:58:45 +0200283 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200284 desc_set_defaults(i, &desc[i], node, NULL);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200285 }
286 return arch_early_irq_init();
287}
288
289struct irq_desc *irq_to_desc(unsigned int irq)
290{
291 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
292}
Paul Gortmaker2c45aad2014-02-10 13:39:53 -0500293EXPORT_SYMBOL(irq_to_desc);
Thomas Gleixner3795de22010-09-22 17:09:43 +0200294
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200295static void free_desc(unsigned int irq)
296{
Thomas Gleixnerd8179bc2014-05-07 15:44:23 +0000297 struct irq_desc *desc = irq_to_desc(irq);
298 unsigned long flags;
299
300 raw_spin_lock_irqsave(&desc->lock, flags);
Jiang Liu67830112015-06-01 16:05:13 +0800301 desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL);
Thomas Gleixnerd8179bc2014-05-07 15:44:23 +0000302 raw_spin_unlock_irqrestore(&desc->lock, flags);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200303}
304
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200305static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
306 struct module *owner)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200307{
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200308 u32 i;
309
310 for (i = 0; i < cnt; i++) {
311 struct irq_desc *desc = irq_to_desc(start + i);
312
313 desc->owner = owner;
314 }
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200315 return start;
316}
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100317
Yinghai Lued4dea62011-02-19 11:07:37 -0800318static int irq_expand_nr_irqs(unsigned int nr)
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100319{
320 return -ENOMEM;
321}
322
Thomas Gleixnerf63b6a02014-05-07 15:44:21 +0000323void irq_mark_irq(unsigned int irq)
324{
325 mutex_lock(&sparse_irq_lock);
326 bitmap_set(allocated_irqs, irq, 1);
327 mutex_unlock(&sparse_irq_lock);
328}
329
Thomas Gleixnerc940e012014-05-07 15:44:22 +0000330#ifdef CONFIG_GENERIC_IRQ_LEGACY
331void irq_init_desc(unsigned int irq)
332{
Thomas Gleixnerd8179bc2014-05-07 15:44:23 +0000333 free_desc(irq);
Thomas Gleixnerc940e012014-05-07 15:44:22 +0000334}
335#endif
336
Thomas Gleixner3795de22010-09-22 17:09:43 +0200337#endif /* !CONFIG_SPARSE_IRQ */
338
Thomas Gleixnerfe12bc22011-05-18 12:48:00 +0200339/**
340 * generic_handle_irq - Invoke the handler for a particular irq
341 * @irq: The irq number to handle
342 *
343 */
344int generic_handle_irq(unsigned int irq)
345{
346 struct irq_desc *desc = irq_to_desc(irq);
347
348 if (!desc)
349 return -EINVAL;
Thomas Gleixnerbd0b9ac2015-09-14 10:42:37 +0200350 generic_handle_irq_desc(desc);
Thomas Gleixnerfe12bc22011-05-18 12:48:00 +0200351 return 0;
352}
Jonathan Cameronedf76f82011-05-18 10:39:04 +0100353EXPORT_SYMBOL_GPL(generic_handle_irq);
Thomas Gleixnerfe12bc22011-05-18 12:48:00 +0200354
Marc Zyngier76ba59f2014-08-26 11:03:16 +0100355#ifdef CONFIG_HANDLE_DOMAIN_IRQ
356/**
357 * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain
358 * @domain: The domain where to perform the lookup
359 * @hwirq: The HW irq number to convert to a logical one
360 * @lookup: Whether to perform the domain lookup or not
361 * @regs: Register file coming from the low-level handling code
362 *
363 * Returns: 0 on success, or -EINVAL if conversion has failed
364 */
365int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
366 bool lookup, struct pt_regs *regs)
367{
368 struct pt_regs *old_regs = set_irq_regs(regs);
369 unsigned int irq = hwirq;
370 int ret = 0;
371
372 irq_enter();
373
374#ifdef CONFIG_IRQ_DOMAIN
375 if (lookup)
376 irq = irq_find_mapping(domain, hwirq);
377#endif
378
379 /*
380 * Some hardware gives randomly wrong interrupts. Rather
381 * than crashing, do something sensible.
382 */
383 if (unlikely(!irq || irq >= nr_irqs)) {
384 ack_bad_irq(irq);
385 ret = -EINVAL;
386 } else {
387 generic_handle_irq(irq);
388 }
389
390 irq_exit();
391 set_irq_regs(old_regs);
392 return ret;
393}
394#endif
395
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200396/* Dynamic interrupt handling */
397
398/**
399 * irq_free_descs - free irq descriptors
400 * @from: Start of descriptor range
401 * @cnt: Number of consecutive irqs to free
402 */
403void irq_free_descs(unsigned int from, unsigned int cnt)
404{
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200405 int i;
406
407 if (from >= nr_irqs || (from + cnt) > nr_irqs)
408 return;
409
410 for (i = 0; i < cnt; i++)
411 free_desc(from + i);
412
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200413 mutex_lock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200414 bitmap_clear(allocated_irqs, from, cnt);
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200415 mutex_unlock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200416}
Jonathan Cameronedf76f82011-05-18 10:39:04 +0100417EXPORT_SYMBOL_GPL(irq_free_descs);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200418
419/**
420 * irq_alloc_descs - allocate and initialize a range of irq descriptors
421 * @irq: Allocate for specific irq number if irq >= 0
422 * @from: Start the search from this irq number
423 * @cnt: Number of consecutive irqs to allocate.
424 * @node: Preferred node on which the irq descriptor should be allocated
Randy Dunlapd522a0d2011-08-18 12:19:27 -0700425 * @owner: Owning module (can be NULL)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200426 *
427 * Returns the first irq number or error code
428 */
429int __ref
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200430__irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
431 struct module *owner)
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200432{
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200433 int start, ret;
434
435 if (!cnt)
436 return -EINVAL;
437
Mark Brownc5182b82011-06-02 18:55:13 +0100438 if (irq >= 0) {
439 if (from > irq)
440 return -EINVAL;
441 from = irq;
Thomas Gleixner62a08ae2014-04-24 09:50:53 +0200442 } else {
443 /*
444 * For interrupts which are freely allocated the
445 * architecture can force a lower bound to the @from
446 * argument. x86 uses this to exclude the GSI space.
447 */
448 from = arch_dynirq_lower_bound(from);
Mark Brownc5182b82011-06-02 18:55:13 +0100449 }
450
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200451 mutex_lock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200452
Yinghai Lued4dea62011-02-19 11:07:37 -0800453 start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
454 from, cnt, 0);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200455 ret = -EEXIST;
456 if (irq >=0 && start != irq)
457 goto err;
458
Yinghai Lued4dea62011-02-19 11:07:37 -0800459 if (start + cnt > nr_irqs) {
460 ret = irq_expand_nr_irqs(start + cnt);
Thomas Gleixnere7bcecb2011-02-16 17:12:57 +0100461 if (ret)
462 goto err;
463 }
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200464
465 bitmap_set(allocated_irqs, start, cnt);
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200466 mutex_unlock(&sparse_irq_lock);
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200467 return alloc_descs(start, cnt, node, owner);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200468
469err:
Thomas Gleixnera05a9002010-10-08 12:47:53 +0200470 mutex_unlock(&sparse_irq_lock);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200471 return ret;
472}
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +0200473EXPORT_SYMBOL_GPL(__irq_alloc_descs);
Thomas Gleixner1f5a5b82010-09-27 17:48:26 +0200474
Thomas Gleixner7b6ef122014-05-07 15:44:05 +0000475#ifdef CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
476/**
477 * irq_alloc_hwirqs - Allocate an irq descriptor and initialize the hardware
478 * @cnt: number of interrupts to allocate
479 * @node: node on which to allocate
480 *
481 * Returns an interrupt number > 0 or 0, if the allocation fails.
482 */
483unsigned int irq_alloc_hwirqs(int cnt, int node)
484{
485 int i, irq = __irq_alloc_descs(-1, 0, cnt, node, NULL);
486
487 if (irq < 0)
488 return 0;
489
490 for (i = irq; cnt > 0; i++, cnt--) {
491 if (arch_setup_hwirq(i, node))
492 goto err;
493 irq_clear_status_flags(i, _IRQ_NOREQUEST);
494 }
495 return irq;
496
497err:
498 for (i--; i >= irq; i--) {
499 irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
500 arch_teardown_hwirq(i);
501 }
502 irq_free_descs(irq, cnt);
503 return 0;
504}
505EXPORT_SYMBOL_GPL(irq_alloc_hwirqs);
506
507/**
508 * irq_free_hwirqs - Free irq descriptor and cleanup the hardware
509 * @from: Free from irq number
510 * @cnt: number of interrupts to free
511 *
512 */
513void irq_free_hwirqs(unsigned int from, int cnt)
514{
Keith Busch8844aad2014-06-30 16:24:44 -0600515 int i, j;
Thomas Gleixner7b6ef122014-05-07 15:44:05 +0000516
Keith Busch8844aad2014-06-30 16:24:44 -0600517 for (i = from, j = cnt; j > 0; i++, j--) {
Thomas Gleixner7b6ef122014-05-07 15:44:05 +0000518 irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
519 arch_teardown_hwirq(i);
520 }
521 irq_free_descs(from, cnt);
522}
523EXPORT_SYMBOL_GPL(irq_free_hwirqs);
524#endif
525
Thomas Gleixnera98d24b2010-09-30 10:45:07 +0200526/**
527 * irq_get_next_irq - get next allocated irq number
528 * @offset: where to start the search
529 *
530 * Returns next irq number after offset or nr_irqs if none is found.
531 */
532unsigned int irq_get_next_irq(unsigned int offset)
533{
534 return find_next_bit(allocated_irqs, nr_irqs, offset);
535}
536
Thomas Gleixnerd5eb4ad22011-02-12 12:16:16 +0100537struct irq_desc *
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100538__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
539 unsigned int check)
Thomas Gleixnerd5eb4ad22011-02-12 12:16:16 +0100540{
541 struct irq_desc *desc = irq_to_desc(irq);
542
543 if (desc) {
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100544 if (check & _IRQ_DESC_CHECK) {
545 if ((check & _IRQ_DESC_PERCPU) &&
546 !irq_settings_is_per_cpu_devid(desc))
547 return NULL;
548
549 if (!(check & _IRQ_DESC_PERCPU) &&
550 irq_settings_is_per_cpu_devid(desc))
551 return NULL;
552 }
553
Thomas Gleixnerd5eb4ad22011-02-12 12:16:16 +0100554 if (bus)
555 chip_bus_lock(desc);
556 raw_spin_lock_irqsave(&desc->lock, *flags);
557 }
558 return desc;
559}
560
561void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
562{
563 raw_spin_unlock_irqrestore(&desc->lock, flags);
564 if (bus)
565 chip_bus_sync_unlock(desc);
566}
567
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100568int irq_set_percpu_devid(unsigned int irq)
569{
570 struct irq_desc *desc = irq_to_desc(irq);
571
572 if (!desc)
573 return -EINVAL;
574
575 if (desc->percpu_enabled)
576 return -EINVAL;
577
578 desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
579
580 if (!desc->percpu_enabled)
581 return -ENOMEM;
582
583 irq_set_percpu_devid_flags(irq);
584 return 0;
585}
586
Thomas Gleixner792d0012014-02-23 21:40:14 +0000587void kstat_incr_irq_this_cpu(unsigned int irq)
588{
Jiang Liub51bf952015-06-04 12:13:25 +0800589 kstat_incr_irqs_this_cpu(irq_to_desc(irq));
Thomas Gleixner792d0012014-02-23 21:40:14 +0000590}
591
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100592/**
593 * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
594 * @irq: The interrupt number
595 * @cpu: The cpu number
596 *
597 * Returns the sum of interrupt counts on @cpu since boot for
598 * @irq. The caller must ensure that the interrupt is not removed
599 * concurrently.
600 */
Thomas Gleixner3795de22010-09-22 17:09:43 +0200601unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
602{
603 struct irq_desc *desc = irq_to_desc(irq);
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800604
605 return desc && desc->kstat_irqs ?
606 *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
Thomas Gleixner3795de22010-09-22 17:09:43 +0200607}
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700608
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100609/**
610 * kstat_irqs - Get the statistics for an interrupt
611 * @irq: The interrupt number
612 *
613 * Returns the sum of interrupt counts on all cpus since boot for
614 * @irq. The caller must ensure that the interrupt is not removed
615 * concurrently.
616 */
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700617unsigned int kstat_irqs(unsigned int irq)
618{
619 struct irq_desc *desc = irq_to_desc(irq);
620 int cpu;
Nicholas Mc Guire5e9662f2015-05-03 10:48:50 +0200621 unsigned int sum = 0;
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700622
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800623 if (!desc || !desc->kstat_irqs)
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700624 return 0;
625 for_each_possible_cpu(cpu)
Eric Dumazet6c9ae002011-01-13 15:45:38 -0800626 sum += *per_cpu_ptr(desc->kstat_irqs, cpu);
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700627 return sum;
628}
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100629
630/**
631 * kstat_irqs_usr - Get the statistics for an interrupt
632 * @irq: The interrupt number
633 *
634 * Returns the sum of interrupt counts on all cpus since boot for
635 * @irq. Contrary to kstat_irqs() this can be called from any
636 * preemptible context. It's protected against concurrent removal of
637 * an interrupt descriptor when sparse irqs are enabled.
638 */
639unsigned int kstat_irqs_usr(unsigned int irq)
640{
Nicholas Mc Guire7df0b272015-05-03 10:49:11 +0200641 unsigned int sum;
Thomas Gleixnerc291ee62014-12-11 23:01:41 +0100642
643 irq_lock_sparse();
644 sum = kstat_irqs(irq);
645 irq_unlock_sparse();
646 return sum;
647}