summaryrefslogtreecommitdiffstats
path: root/kernel/irq/debugfs.c
blob: c1eccd4f65207c0036453ad7d85d39a2b91df1cd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
// SPDX-License-Identifier: GPL-2.0
// Copyright 2017 Thomas Gleixner <tglx@linutronix.de>

#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/uaccess.h>

#include "internals.h"

static struct dentry *irq_dir;

struct irq_bit_descr {
	unsigned int	mask;
	char		*name;
};
#define BIT_MASK_DESCR(m)	{ .mask = m, .name = #m }

static void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state,
				const struct irq_bit_descr *sd, int size)
{
	int i;

	for (i = 0; i < size; i++, sd++) {
		if (state & sd->mask)
			seq_printf(m, "%*s%s\n", ind + 12, "", sd->name);
	}
}

#ifdef CONFIG_SMP
static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc)
{
	struct irq_data *data = irq_desc_get_irq_data(desc);
	struct cpumask *msk;

	msk = irq_data_get_affinity_mask(data);
	seq_printf(m, "affinity: %*pbl\n", cpumask_pr_args(msk));
#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	msk = irq_data_get_effective_affinity_mask(data);
	seq_printf(m, "effectiv: %*pbl\n", cpumask_pr_args(msk));
#endif
#ifdef CONFIG_GENERIC_PENDING_IRQ
	msk = desc->pending_mask;
	seq_printf(m, "pending:  %*pbl\n", cpumask_pr_args(msk));
#endif
}
#else
static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc) { }
#endif

static const struct irq_bit_descr irqchip_flags[] = {
	BIT_MASK_DESCR(IRQCHIP_SET_TYPE_MASKED),
	BIT_MASK_DESCR(IRQCHIP_EOI_IF_HANDLED),
	BIT_MASK_DESCR(IRQCHIP_MASK_ON_SUSPEND),
	BIT_MASK_DESCR(IRQCHIP_ONOFFLINE_ENABLED),
	BIT_MASK_DESCR(IRQCHIP_SKIP_SET_WAKE),
	BIT_MASK_DESCR(IRQCHIP_ONESHOT_SAFE),
	BIT_MASK_DESCR(IRQCHIP_EOI_THREADED),
	BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI),
	BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI),
};

static void
irq_debug_show_chip(struct seq_file *m, struct irq_data *data, int ind)
{
	struct irq_chip *chip = data->chip;

	if (!chip) {
		seq_printf(m, "chip: None\n");
		return;
	}
	seq_printf(m, "%*schip:    %s\n", ind, "", chip->name);
	seq_printf(m, "%*sflags:   0x%lx\n", ind + 1, "", chip->flags);
	irq_debug_show_bits(m, ind, chip->flags, irqchip_flags,
			    ARRAY_SIZE(irqchip_flags));
}

static void
irq_debug_show_data(struct seq_file *m, struct irq_data *data, int ind)
{
	seq_printf(m, "%*sdomain:  %s\n", ind, "",
		   data->domain ? data->domain->name : "");
	seq_printf(m, "%*shwirq:   0x%lx\n", ind + 1, "", data->hwirq);
	irq_debug_show_chip(m, data, ind + 1);
	if (data->domain && data->domain->ops && data->domain->ops->debug_show)
		data->domain->ops->debug_show(m, NULL, data, ind + 1);
#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
	if (!data->parent_data)
		return;
	seq_printf(m, "%*sparent:\n", ind + 1, "");
	irq_debug_show_data(m, data->parent_data, ind + 4);
#endif
}

static const struct irq_bit_descr irqdata_states[] = {
	BIT_MASK_DESCR(IRQ_TYPE_EDGE_RISING),
	BIT_MASK_DESCR(IRQ_TYPE_EDGE_FALLING),
	BIT_MASK_DESCR(IRQ_TYPE_LEVEL_HIGH),
	BIT_MASK_DESCR(IRQ_TYPE_LEVEL_LOW),
	BIT_MASK_DESCR(IRQD_LEVEL),

	BIT_MASK_DESCR(IRQD_ACTIVATED),
	BIT_MASK_DESCR(IRQD_IRQ_STARTED),
	BIT_MASK_DESCR(IRQD_IRQ_DISABLED),
	BIT_MASK_DESCR(IRQD_IRQ_MASKED),
	BIT_MASK_DESCR(IRQD_IRQ_INPROGRESS),

	BIT_MASK_DESCR(IRQD_PER_CPU),
	BIT_MASK_DESCR(IRQD_NO_BALANCING),

	BIT_MASK_DESCR(IRQD_SINGLE_TARGET),
	BIT_MASK_DESCR(IRQD_MOVE_PCNTXT),
	BIT_MASK_DESCR(IRQD_AFFINITY_SET),
	BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING),
	BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED),
	BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN),
	BIT_MASK_DESCR(IRQD_CAN_RESERVE),

	BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU),

	BIT_MASK_DESCR(IRQD_WAKEUP_STATE),
	BIT_MASK_DESCR(IRQD_WAKEUP_ARMED),
};

static const struct irq_bit_descr irqdesc_states[] = {
	BIT_MASK_DESCR(_IRQ_NOPROBE),
	BIT_MASK_DESCR(_IRQ_NOREQUEST),
	BIT_MASK_DESCR(_IRQ_NOTHREAD),
	BIT_MASK_DESCR(_IRQ_NOAUTOEN),
	BIT_MASK_DESCR(_IRQ_NESTED_THREAD),
	BIT_MASK_DESCR(_IRQ_PER_CPU_DEVID),
	BIT_MASK_DESCR(_IRQ_IS_POLLED),
	BIT_MASK_DESCR(_IRQ_DISABLE_UNLAZY),
};

static const struct irq_bit_descr irqdesc_istates[] = {
	BIT_MASK_DESCR(IRQS_AUTODETECT),
	BIT_MASK_DESCR(IRQS_SPURIOUS_DISABLED),
	BIT_MASK_DESCR(IRQS_POLL_INPROGRESS),
	BIT_MASK_DESCR(IRQS_ONESHOT),
	BIT_MASK_DESCR(IRQS_REPLAY),
	BIT_MASK_DESCR(IRQS_WAITING),
	BIT_MASK_DESCR(IRQS_PENDING),
	BIT_MASK_DESCR(IRQS_SUSPENDED),
	BIT_MASK_DESCR(IRQS_NMI),
};


static int irq_debug_show(struct seq_file *m, void *p)
{
	struct irq_desc *desc = m->private;
	struct irq_data *data;

	raw_spin_lock_irq(&desc->lock);
	data = irq_desc_get_irq_data(desc);
	seq_printf(m, "handler:  %ps\n", desc->handle_irq);
	seq_printf(m, "device:   %s\n", desc->dev_name);
	seq_printf(m, "status:   0x%08x\n", desc->status_use_accessors);
	irq_debug_show_bits(m, 0, desc->status_use_accessors, irqdesc_states,
			    ARRAY_SIZE(irqdesc_states));
	seq_printf(m, "istate:   0x%08x\n", desc->istate);
	irq_debug_show_bits(m, 0, desc->istate, irqdesc_istates,
			    ARRAY_SIZE(irqdesc_istates));
	seq_printf(m, "ddepth:   %u\n", desc->depth);
	seq_printf(m, "wdepth:   %u\n", desc->wake_depth);
	seq_printf(m, "dstate:   0x%08x\n", irqd_get(data));
	irq_debug_show_bits(m, 0, irqd_get(data), irqdata_states,
			    ARRAY_SIZE(irqdata_states));
	seq_printf(m, "node:     %d\n", irq_data_get_node(data));
	irq_debug_show_masks(m, desc);
	irq_debug_show_data(m, data, 0);
	raw_spin_unlock_irq(&desc->lock);
	return 0;
}

static int irq_debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, irq_debug_show, inode->i_private);
}

static ssize_t irq_debug_write(struct file *file, const char __user *user_buf,
			       size_t count, loff_t *ppos)
{
	struct irq_desc *desc = file_inode(file)->i_private;
	char buf[8] = { 0, };
	size_t size;

	size = min(sizeof(buf) - 1, count);
	if (copy_from_user(buf, user_buf, size))
		return -EFAULT;

	if (!strncmp(buf, "trigger", size)) {
		unsigned long flags;
		int err;

		/* Try the HW interface first */
		err = irq_set_irqchip_state(irq_desc_get_irq(desc),
					    IRQCHIP_STATE_PENDING, true);
		if (!err)
			return count;

		/*
		 * Otherwise, try to inject via the resend interface,
		 * which may or may not succeed.
		 */
		chip_bus_lock(desc);
		raw_spin_lock_irqsave(&desc->lock, flags);

		if (irq_settings_is_level(desc) || desc->istate & IRQS_NMI) {
			/* Can't do level nor NMIs, sorry */
			err = -EINVAL;
		} else {
			desc->istate |= IRQS_PENDING;
			check_irq_resend(desc);
			err = 0;
		}

		raw_spin_unlock_irqrestore(&desc->lock, flags);
		chip_bus_sync_unlock(desc);

		return err ? err : count;
	}

	return count;
}

static const struct file_operations dfs_irq_ops = {
	.open		= irq_debug_open,
	.write		= irq_debug_write,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

void irq_debugfs_copy_devname(int irq, struct device *dev)
{
	struct irq_desc *desc = irq_to_desc(irq);
	const char *name = dev_name(dev);

	if (name)
		desc->dev_name = kstrdup(name, GFP_KERNEL);
}

void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc)
{
	char name [10];

	if (!irq_dir || !desc || desc->debugfs_file)
		return;

	sprintf(name, "%d", irq);
	desc->debugfs_file = debugfs_create_file(name, 0644, irq_dir, desc,
						 &dfs_irq_ops);
}

static int __init irq_debugfs_init(void)
{
	struct dentry *root_dir;
	int irq;

	root_dir = debugfs_create_dir("irq", NULL);

	irq_domain_debugfs_init(root_dir);

	irq_dir = debugfs_create_dir("irqs", root_dir);

	irq_lock_sparse();
	for_each_active_irq(irq)
		irq_add_debugfs_entry(irq, irq_to_desc(irq));
	irq_unlock_sparse();

	return 0;
}
__initcall(irq_debugfs_init);