1 /*
2 * Copyright 2017 Thomas Gleixner <tglx@linutronix.de>
3 *
4 * This file is licensed under the GPL V2.
5 */
6 #include <linux/irqdomain.h>
7 #include <linux/irq.h>
8 #include <linux/uaccess.h>
9
10 #include "internals.h"
11
12 static struct dentry *irq_dir;
13
14 struct irq_bit_descr {
15 unsigned int mask;
16 char *name;
17 };
18 #define BIT_MASK_DESCR(m) { .mask = m, .name = #m }
19
irq_debug_show_bits(struct seq_file * m,int ind,unsigned int state,const struct irq_bit_descr * sd,int size)20 static void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state,
21 const struct irq_bit_descr *sd, int size)
22 {
23 int i;
24
25 for (i = 0; i < size; i++, sd++) {
26 if (state & sd->mask)
27 seq_printf(m, "%*s%s\n", ind + 12, "", sd->name);
28 }
29 }
30
31 #ifdef CONFIG_SMP
irq_debug_show_masks(struct seq_file * m,struct irq_desc * desc)32 static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc)
33 {
34 struct irq_data *data = irq_desc_get_irq_data(desc);
35 struct cpumask *msk;
36
37 msk = irq_data_get_affinity_mask(data);
38 seq_printf(m, "affinity: %*pbl\n", cpumask_pr_args(msk));
39 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
40 msk = irq_data_get_effective_affinity_mask(data);
41 seq_printf(m, "effectiv: %*pbl\n", cpumask_pr_args(msk));
42 #endif
43 #ifdef CONFIG_GENERIC_PENDING_IRQ
44 msk = desc->pending_mask;
45 seq_printf(m, "pending: %*pbl\n", cpumask_pr_args(msk));
46 #endif
47 }
48 #else
irq_debug_show_masks(struct seq_file * m,struct irq_desc * desc)49 static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc) { }
50 #endif
51
52 static const struct irq_bit_descr irqchip_flags[] = {
53 BIT_MASK_DESCR(IRQCHIP_SET_TYPE_MASKED),
54 BIT_MASK_DESCR(IRQCHIP_EOI_IF_HANDLED),
55 BIT_MASK_DESCR(IRQCHIP_MASK_ON_SUSPEND),
56 BIT_MASK_DESCR(IRQCHIP_ONOFFLINE_ENABLED),
57 BIT_MASK_DESCR(IRQCHIP_SKIP_SET_WAKE),
58 BIT_MASK_DESCR(IRQCHIP_ONESHOT_SAFE),
59 BIT_MASK_DESCR(IRQCHIP_EOI_THREADED),
60 };
61
62 static void
irq_debug_show_chip(struct seq_file * m,struct irq_data * data,int ind)63 irq_debug_show_chip(struct seq_file *m, struct irq_data *data, int ind)
64 {
65 struct irq_chip *chip = data->chip;
66
67 if (!chip) {
68 seq_printf(m, "chip: None\n");
69 return;
70 }
71 seq_printf(m, "%*schip: %s\n", ind, "", chip->name);
72 seq_printf(m, "%*sflags: 0x%lx\n", ind + 1, "", chip->flags);
73 irq_debug_show_bits(m, ind, chip->flags, irqchip_flags,
74 ARRAY_SIZE(irqchip_flags));
75 }
76
77 static void
irq_debug_show_data(struct seq_file * m,struct irq_data * data,int ind)78 irq_debug_show_data(struct seq_file *m, struct irq_data *data, int ind)
79 {
80 seq_printf(m, "%*sdomain: %s\n", ind, "",
81 data->domain ? data->domain->name : "");
82 seq_printf(m, "%*shwirq: 0x%lx\n", ind + 1, "", data->hwirq);
83 irq_debug_show_chip(m, data, ind + 1);
84 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
85 if (!data->parent_data)
86 return;
87 seq_printf(m, "%*sparent:\n", ind + 1, "");
88 irq_debug_show_data(m, data->parent_data, ind + 4);
89 #endif
90 }
91
92 static const struct irq_bit_descr irqdata_states[] = {
93 BIT_MASK_DESCR(IRQ_TYPE_EDGE_RISING),
94 BIT_MASK_DESCR(IRQ_TYPE_EDGE_FALLING),
95 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_HIGH),
96 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_LOW),
97 BIT_MASK_DESCR(IRQD_LEVEL),
98
99 BIT_MASK_DESCR(IRQD_ACTIVATED),
100 BIT_MASK_DESCR(IRQD_IRQ_STARTED),
101 BIT_MASK_DESCR(IRQD_IRQ_DISABLED),
102 BIT_MASK_DESCR(IRQD_IRQ_MASKED),
103 BIT_MASK_DESCR(IRQD_IRQ_INPROGRESS),
104
105 BIT_MASK_DESCR(IRQD_PER_CPU),
106 BIT_MASK_DESCR(IRQD_NO_BALANCING),
107
108 BIT_MASK_DESCR(IRQD_SINGLE_TARGET),
109 BIT_MASK_DESCR(IRQD_MOVE_PCNTXT),
110 BIT_MASK_DESCR(IRQD_AFFINITY_SET),
111 BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING),
112 BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED),
113 BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN),
114
115 BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU),
116
117 BIT_MASK_DESCR(IRQD_WAKEUP_STATE),
118 BIT_MASK_DESCR(IRQD_WAKEUP_ARMED),
119 };
120
121 static const struct irq_bit_descr irqdesc_states[] = {
122 BIT_MASK_DESCR(_IRQ_NOPROBE),
123 BIT_MASK_DESCR(_IRQ_NOREQUEST),
124 BIT_MASK_DESCR(_IRQ_NOTHREAD),
125 BIT_MASK_DESCR(_IRQ_NOAUTOEN),
126 BIT_MASK_DESCR(_IRQ_NESTED_THREAD),
127 BIT_MASK_DESCR(_IRQ_PER_CPU_DEVID),
128 BIT_MASK_DESCR(_IRQ_IS_POLLED),
129 BIT_MASK_DESCR(_IRQ_DISABLE_UNLAZY),
130 };
131
132 static const struct irq_bit_descr irqdesc_istates[] = {
133 BIT_MASK_DESCR(IRQS_AUTODETECT),
134 BIT_MASK_DESCR(IRQS_SPURIOUS_DISABLED),
135 BIT_MASK_DESCR(IRQS_POLL_INPROGRESS),
136 BIT_MASK_DESCR(IRQS_ONESHOT),
137 BIT_MASK_DESCR(IRQS_REPLAY),
138 BIT_MASK_DESCR(IRQS_WAITING),
139 BIT_MASK_DESCR(IRQS_PENDING),
140 BIT_MASK_DESCR(IRQS_SUSPENDED),
141 };
142
143
irq_debug_show(struct seq_file * m,void * p)144 static int irq_debug_show(struct seq_file *m, void *p)
145 {
146 struct irq_desc *desc = m->private;
147 struct irq_data *data;
148
149 raw_spin_lock_irq(&desc->lock);
150 data = irq_desc_get_irq_data(desc);
151 seq_printf(m, "handler: %pf\n", desc->handle_irq);
152 seq_printf(m, "status: 0x%08x\n", desc->status_use_accessors);
153 irq_debug_show_bits(m, 0, desc->status_use_accessors, irqdesc_states,
154 ARRAY_SIZE(irqdesc_states));
155 seq_printf(m, "istate: 0x%08x\n", desc->istate);
156 irq_debug_show_bits(m, 0, desc->istate, irqdesc_istates,
157 ARRAY_SIZE(irqdesc_istates));
158 seq_printf(m, "ddepth: %u\n", desc->depth);
159 seq_printf(m, "wdepth: %u\n", desc->wake_depth);
160 seq_printf(m, "dstate: 0x%08x\n", irqd_get(data));
161 irq_debug_show_bits(m, 0, irqd_get(data), irqdata_states,
162 ARRAY_SIZE(irqdata_states));
163 seq_printf(m, "node: %d\n", irq_data_get_node(data));
164 irq_debug_show_masks(m, desc);
165 irq_debug_show_data(m, data, 0);
166 raw_spin_unlock_irq(&desc->lock);
167 return 0;
168 }
169
irq_debug_open(struct inode * inode,struct file * file)170 static int irq_debug_open(struct inode *inode, struct file *file)
171 {
172 return single_open(file, irq_debug_show, inode->i_private);
173 }
174
irq_debug_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)175 static ssize_t irq_debug_write(struct file *file, const char __user *user_buf,
176 size_t count, loff_t *ppos)
177 {
178 struct irq_desc *desc = file_inode(file)->i_private;
179 char buf[8] = { 0, };
180 size_t size;
181
182 size = min(sizeof(buf) - 1, count);
183 if (copy_from_user(buf, user_buf, size))
184 return -EFAULT;
185
186 if (!strncmp(buf, "trigger", size)) {
187 unsigned long flags;
188 int err;
189
190 /* Try the HW interface first */
191 err = irq_set_irqchip_state(irq_desc_get_irq(desc),
192 IRQCHIP_STATE_PENDING, true);
193 if (!err)
194 return count;
195
196 /*
197 * Otherwise, try to inject via the resend interface,
198 * which may or may not succeed.
199 */
200 chip_bus_lock(desc);
201 raw_spin_lock_irqsave(&desc->lock, flags);
202
203 if (irq_settings_is_level(desc)) {
204 /* Can't do level, sorry */
205 err = -EINVAL;
206 } else {
207 desc->istate |= IRQS_PENDING;
208 check_irq_resend(desc);
209 err = 0;
210 }
211
212 raw_spin_unlock_irqrestore(&desc->lock, flags);
213 chip_bus_sync_unlock(desc);
214
215 return err ? err : count;
216 }
217
218 return count;
219 }
220
221 static const struct file_operations dfs_irq_ops = {
222 .open = irq_debug_open,
223 .write = irq_debug_write,
224 .read = seq_read,
225 .llseek = seq_lseek,
226 .release = single_release,
227 };
228
irq_add_debugfs_entry(unsigned int irq,struct irq_desc * desc)229 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc)
230 {
231 char name [10];
232
233 if (!irq_dir || !desc || desc->debugfs_file)
234 return;
235
236 sprintf(name, "%d", irq);
237 desc->debugfs_file = debugfs_create_file(name, 0644, irq_dir, desc,
238 &dfs_irq_ops);
239 }
240
irq_debugfs_init(void)241 static int __init irq_debugfs_init(void)
242 {
243 struct dentry *root_dir;
244 int irq;
245
246 root_dir = debugfs_create_dir("irq", NULL);
247 if (!root_dir)
248 return -ENOMEM;
249
250 irq_domain_debugfs_init(root_dir);
251
252 irq_dir = debugfs_create_dir("irqs", root_dir);
253
254 irq_lock_sparse();
255 for_each_active_irq(irq)
256 irq_add_debugfs_entry(irq, irq_to_desc(irq));
257 irq_unlock_sparse();
258
259 return 0;
260 }
261 __initcall(irq_debugfs_init);
262