projects/linux·blob v4.13 · refs

213 lines · 5.8 KiB

1/*
2 * Copyright 2017 Thomas Gleixner <[email protected]>
3 *
4 * This file is licensed under the GPL V2.
5 */
6#include <linux/irqdomain.h>
7#include <linux/irq.h>
8
9#include "internals.h"
10
11static struct dentry *irq_dir;
12
13struct irq_bit_descr {
14 unsigned int mask;
15 char *name;
16};
17#define BIT_MASK_DESCR(m) { .mask = m, .name = #m }
18
19static void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state,
20 const struct irq_bit_descr *sd, int size)
21{
22 int i;
23
24 for (i = 0; i < size; i++, sd++) {
25 if (state & sd->mask)
26 seq_printf(m, "%*s%s\n", ind + 12, "", sd->name);
27 }
28}
29
30#ifdef CONFIG_SMP
31static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc)
32{
33 struct irq_data *data = irq_desc_get_irq_data(desc);
34 struct cpumask *msk;
35
36 msk = irq_data_get_affinity_mask(data);
37 seq_printf(m, "affinity: %*pbl\n", cpumask_pr_args(msk));
38#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
39 msk = irq_data_get_effective_affinity_mask(data);
40 seq_printf(m, "effectiv: %*pbl\n", cpumask_pr_args(msk));
41#endif
42#ifdef CONFIG_GENERIC_PENDING_IRQ
43 msk = desc->pending_mask;
44 seq_printf(m, "pending: %*pbl\n", cpumask_pr_args(msk));
45#endif
46}
47#else
48static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc) { }
49#endif
50
51static const struct irq_bit_descr irqchip_flags[] = {
52 BIT_MASK_DESCR(IRQCHIP_SET_TYPE_MASKED),
53 BIT_MASK_DESCR(IRQCHIP_EOI_IF_HANDLED),
54 BIT_MASK_DESCR(IRQCHIP_MASK_ON_SUSPEND),
55 BIT_MASK_DESCR(IRQCHIP_ONOFFLINE_ENABLED),
56 BIT_MASK_DESCR(IRQCHIP_SKIP_SET_WAKE),
57 BIT_MASK_DESCR(IRQCHIP_ONESHOT_SAFE),
58 BIT_MASK_DESCR(IRQCHIP_EOI_THREADED),
59};
60
61static void
62irq_debug_show_chip(struct seq_file *m, struct irq_data *data, int ind)
63{
64 struct irq_chip *chip = data->chip;
65
66 if (!chip) {
67 seq_printf(m, "chip: None\n");
68 return;
69 }
70 seq_printf(m, "%*schip: %s\n", ind, "", chip->name);
71 seq_printf(m, "%*sflags: 0x%lx\n", ind + 1, "", chip->flags);
72 irq_debug_show_bits(m, ind, chip->flags, irqchip_flags,
73 ARRAY_SIZE(irqchip_flags));
74}
75
76static void
77irq_debug_show_data(struct seq_file *m, struct irq_data *data, int ind)
78{
79 seq_printf(m, "%*sdomain: %s\n", ind, "",
80 data->domain ? data->domain->name : "");
81 seq_printf(m, "%*shwirq: 0x%lx\n", ind + 1, "", data->hwirq);
82 irq_debug_show_chip(m, data, ind + 1);
83#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
84 if (!data->parent_data)
85 return;
86 seq_printf(m, "%*sparent:\n", ind + 1, "");
87 irq_debug_show_data(m, data->parent_data, ind + 4);
88#endif
89}
90
91static const struct irq_bit_descr irqdata_states[] = {
92 BIT_MASK_DESCR(IRQ_TYPE_EDGE_RISING),
93 BIT_MASK_DESCR(IRQ_TYPE_EDGE_FALLING),
94 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_HIGH),
95 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_LOW),
96 BIT_MASK_DESCR(IRQD_LEVEL),
97
98 BIT_MASK_DESCR(IRQD_ACTIVATED),
99 BIT_MASK_DESCR(IRQD_IRQ_STARTED),
100 BIT_MASK_DESCR(IRQD_IRQ_DISABLED),
101 BIT_MASK_DESCR(IRQD_IRQ_MASKED),
102 BIT_MASK_DESCR(IRQD_IRQ_INPROGRESS),
103
104 BIT_MASK_DESCR(IRQD_PER_CPU),
105 BIT_MASK_DESCR(IRQD_NO_BALANCING),
106
107 BIT_MASK_DESCR(IRQD_SINGLE_TARGET),
108 BIT_MASK_DESCR(IRQD_MOVE_PCNTXT),
109 BIT_MASK_DESCR(IRQD_AFFINITY_SET),
110 BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING),
111 BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED),
112 BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN),
113
114 BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU),
115
116 BIT_MASK_DESCR(IRQD_WAKEUP_STATE),
117 BIT_MASK_DESCR(IRQD_WAKEUP_ARMED),
118};
119
120static const struct irq_bit_descr irqdesc_states[] = {
121 BIT_MASK_DESCR(_IRQ_NOPROBE),
122 BIT_MASK_DESCR(_IRQ_NOREQUEST),
123 BIT_MASK_DESCR(_IRQ_NOTHREAD),
124 BIT_MASK_DESCR(_IRQ_NOAUTOEN),
125 BIT_MASK_DESCR(_IRQ_NESTED_THREAD),
126 BIT_MASK_DESCR(_IRQ_PER_CPU_DEVID),
127 BIT_MASK_DESCR(_IRQ_IS_POLLED),
128 BIT_MASK_DESCR(_IRQ_DISABLE_UNLAZY),
129};
130
131static const struct irq_bit_descr irqdesc_istates[] = {
132 BIT_MASK_DESCR(IRQS_AUTODETECT),
133 BIT_MASK_DESCR(IRQS_SPURIOUS_DISABLED),
134 BIT_MASK_DESCR(IRQS_POLL_INPROGRESS),
135 BIT_MASK_DESCR(IRQS_ONESHOT),
136 BIT_MASK_DESCR(IRQS_REPLAY),
137 BIT_MASK_DESCR(IRQS_WAITING),
138 BIT_MASK_DESCR(IRQS_PENDING),
139 BIT_MASK_DESCR(IRQS_SUSPENDED),
140};
141
142
143static int irq_debug_show(struct seq_file *m, void *p)
144{
145 struct irq_desc *desc = m->private;
146 struct irq_data *data;
147
148 raw_spin_lock_irq(&desc->lock);
149 data = irq_desc_get_irq_data(desc);
150 seq_printf(m, "handler: %pf\n", desc->handle_irq);
151 seq_printf(m, "status: 0x%08x\n", desc->status_use_accessors);
152 irq_debug_show_bits(m, 0, desc->status_use_accessors, irqdesc_states,
153 ARRAY_SIZE(irqdesc_states));
154 seq_printf(m, "istate: 0x%08x\n", desc->istate);
155 irq_debug_show_bits(m, 0, desc->istate, irqdesc_istates,
156 ARRAY_SIZE(irqdesc_istates));
157 seq_printf(m, "ddepth: %u\n", desc->depth);
158 seq_printf(m, "wdepth: %u\n", desc->wake_depth);
159 seq_printf(m, "dstate: 0x%08x\n", irqd_get(data));
160 irq_debug_show_bits(m, 0, irqd_get(data), irqdata_states,
161 ARRAY_SIZE(irqdata_states));
162 seq_printf(m, "node: %d\n", irq_data_get_node(data));
163 irq_debug_show_masks(m, desc);
164 irq_debug_show_data(m, data, 0);
165 raw_spin_unlock_irq(&desc->lock);
166 return 0;
167}
168
169static int irq_debug_open(struct inode *inode, struct file *file)
170{
171 return single_open(file, irq_debug_show, inode->i_private);
172}
173
174static const struct file_operations dfs_irq_ops = {
175 .open = irq_debug_open,
176 .read = seq_read,
177 .llseek = seq_lseek,
178 .release = single_release,
179};
180
181void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc)
182{
183 char name [10];
184
185 if (!irq_dir || !desc || desc->debugfs_file)
186 return;
187
188 sprintf(name, "%d", irq);
189 desc->debugfs_file = debugfs_create_file(name, 0444, irq_dir, desc,
190 &dfs_irq_ops);
191}
192
193static int __init irq_debugfs_init(void)
194{
195 struct dentry *root_dir;
196 int irq;
197
198 root_dir = debugfs_create_dir("irq", NULL);
199 if (!root_dir)
200 return -ENOMEM;
201
202 irq_domain_debugfs_init(root_dir);
203
204 irq_dir = debugfs_create_dir("irqs", root_dir);
205
206 irq_lock_sparse();
207 for_each_active_irq(irq)
208 irq_add_debugfs_entry(irq, irq_to_desc(irq));
209 irq_unlock_sparse();
210
211 return 0;
212}
213__initcall(irq_debugfs_init);