1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright 2017 Thomas Gleixner <tglx@linutronix.de>
3
4 #include <linux/irqdomain.h>
5 #include <linux/irq.h>
6 #include <linux/uaccess.h>
7
8 #include "internals.h"
9
10 static struct dentry *irq_dir;
11
12 struct irq_bit_descr {
13 unsigned int mask;
14 char *name;
15 };
16 #define BIT_MASK_DESCR(m) { .mask = m, .name = #m }
17
irq_debug_show_bits(struct seq_file * m,int ind,unsigned int state,const struct irq_bit_descr * sd,int size)18 static void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state,
19 const struct irq_bit_descr *sd, int size)
20 {
21 int i;
22
23 for (i = 0; i < size; i++, sd++) {
24 if (state & sd->mask)
25 seq_printf(m, "%*s%s\n", ind + 12, "", sd->name);
26 }
27 }
28
29 #ifdef CONFIG_SMP
irq_debug_show_masks(struct seq_file * m,struct irq_desc * desc)30 static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc)
31 {
32 struct irq_data *data = irq_desc_get_irq_data(desc);
33 const struct cpumask *msk;
34
35 msk = irq_data_get_affinity_mask(data);
36 seq_printf(m, "affinity: %*pbl\n", cpumask_pr_args(msk));
37 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
38 msk = irq_data_get_effective_affinity_mask(data);
39 seq_printf(m, "effectiv: %*pbl\n", cpumask_pr_args(msk));
40 #endif
41 #ifdef CONFIG_GENERIC_PENDING_IRQ
42 msk = desc->pending_mask;
43 seq_printf(m, "pending: %*pbl\n", cpumask_pr_args(msk));
44 #endif
45 }
46 #else
irq_debug_show_masks(struct seq_file * m,struct irq_desc * desc)47 static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc) { }
48 #endif
49
50 static const struct irq_bit_descr irqchip_flags[] = {
51 BIT_MASK_DESCR(IRQCHIP_SET_TYPE_MASKED),
52 BIT_MASK_DESCR(IRQCHIP_EOI_IF_HANDLED),
53 BIT_MASK_DESCR(IRQCHIP_MASK_ON_SUSPEND),
54 BIT_MASK_DESCR(IRQCHIP_ONOFFLINE_ENABLED),
55 BIT_MASK_DESCR(IRQCHIP_SKIP_SET_WAKE),
56 BIT_MASK_DESCR(IRQCHIP_ONESHOT_SAFE),
57 BIT_MASK_DESCR(IRQCHIP_EOI_THREADED),
58 BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI),
59 BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI),
60 BIT_MASK_DESCR(IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND),
61 BIT_MASK_DESCR(IRQCHIP_IMMUTABLE),
62 };
63
64 static void
irq_debug_show_chip(struct seq_file * m,struct irq_data * data,int ind)65 irq_debug_show_chip(struct seq_file *m, struct irq_data *data, int ind)
66 {
67 struct irq_chip *chip = data->chip;
68
69 if (!chip) {
70 seq_printf(m, "chip: None\n");
71 return;
72 }
73 seq_printf(m, "%*schip: ", ind, "");
74 if (chip->irq_print_chip)
75 chip->irq_print_chip(data, m);
76 else
77 seq_printf(m, "%s", chip->name);
78 seq_printf(m, "\n%*sflags: 0x%lx\n", ind + 1, "", chip->flags);
79 irq_debug_show_bits(m, ind, chip->flags, irqchip_flags,
80 ARRAY_SIZE(irqchip_flags));
81 }
82
83 static void
irq_debug_show_data(struct seq_file * m,struct irq_data * data,int ind)84 irq_debug_show_data(struct seq_file *m, struct irq_data *data, int ind)
85 {
86 seq_printf(m, "%*sdomain: %s\n", ind, "",
87 data->domain ? data->domain->name : "");
88 seq_printf(m, "%*shwirq: 0x%lx\n", ind + 1, "", data->hwirq);
89 irq_debug_show_chip(m, data, ind + 1);
90 if (data->domain && data->domain->ops && data->domain->ops->debug_show)
91 data->domain->ops->debug_show(m, NULL, data, ind + 1);
92 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
93 if (!data->parent_data)
94 return;
95 seq_printf(m, "%*sparent:\n", ind + 1, "");
96 irq_debug_show_data(m, data->parent_data, ind + 4);
97 #endif
98 }
99
100 static const struct irq_bit_descr irqdata_states[] = {
101 BIT_MASK_DESCR(IRQ_TYPE_EDGE_RISING),
102 BIT_MASK_DESCR(IRQ_TYPE_EDGE_FALLING),
103 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_HIGH),
104 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_LOW),
105 BIT_MASK_DESCR(IRQD_LEVEL),
106
107 BIT_MASK_DESCR(IRQD_ACTIVATED),
108 BIT_MASK_DESCR(IRQD_IRQ_STARTED),
109 BIT_MASK_DESCR(IRQD_IRQ_DISABLED),
110 BIT_MASK_DESCR(IRQD_IRQ_MASKED),
111 BIT_MASK_DESCR(IRQD_IRQ_INPROGRESS),
112
113 BIT_MASK_DESCR(IRQD_PER_CPU),
114 BIT_MASK_DESCR(IRQD_NO_BALANCING),
115
116 BIT_MASK_DESCR(IRQD_SINGLE_TARGET),
117 BIT_MASK_DESCR(IRQD_MOVE_PCNTXT),
118 BIT_MASK_DESCR(IRQD_AFFINITY_SET),
119 BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING),
120 BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED),
121 BIT_MASK_DESCR(IRQD_AFFINITY_ON_ACTIVATE),
122 BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN),
123 BIT_MASK_DESCR(IRQD_CAN_RESERVE),
124
125 BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU),
126
127 BIT_MASK_DESCR(IRQD_WAKEUP_STATE),
128 BIT_MASK_DESCR(IRQD_WAKEUP_ARMED),
129
130 BIT_MASK_DESCR(IRQD_DEFAULT_TRIGGER_SET),
131
132 BIT_MASK_DESCR(IRQD_HANDLE_ENFORCE_IRQCTX),
133
134 BIT_MASK_DESCR(IRQD_IRQ_ENABLED_ON_SUSPEND),
135 };
136
137 static const struct irq_bit_descr irqdesc_states[] = {
138 BIT_MASK_DESCR(_IRQ_NOPROBE),
139 BIT_MASK_DESCR(_IRQ_NOREQUEST),
140 BIT_MASK_DESCR(_IRQ_NOTHREAD),
141 BIT_MASK_DESCR(_IRQ_NOAUTOEN),
142 BIT_MASK_DESCR(_IRQ_NESTED_THREAD),
143 BIT_MASK_DESCR(_IRQ_PER_CPU_DEVID),
144 BIT_MASK_DESCR(_IRQ_IS_POLLED),
145 BIT_MASK_DESCR(_IRQ_DISABLE_UNLAZY),
146 BIT_MASK_DESCR(_IRQ_HIDDEN),
147 };
148
149 static const struct irq_bit_descr irqdesc_istates[] = {
150 BIT_MASK_DESCR(IRQS_AUTODETECT),
151 BIT_MASK_DESCR(IRQS_SPURIOUS_DISABLED),
152 BIT_MASK_DESCR(IRQS_POLL_INPROGRESS),
153 BIT_MASK_DESCR(IRQS_ONESHOT),
154 BIT_MASK_DESCR(IRQS_REPLAY),
155 BIT_MASK_DESCR(IRQS_WAITING),
156 BIT_MASK_DESCR(IRQS_PENDING),
157 BIT_MASK_DESCR(IRQS_SUSPENDED),
158 BIT_MASK_DESCR(IRQS_NMI),
159 };
160
161
irq_debug_show(struct seq_file * m,void * p)162 static int irq_debug_show(struct seq_file *m, void *p)
163 {
164 struct irq_desc *desc = m->private;
165 struct irq_data *data;
166
167 raw_spin_lock_irq(&desc->lock);
168 data = irq_desc_get_irq_data(desc);
169 seq_printf(m, "handler: %ps\n", desc->handle_irq);
170 seq_printf(m, "device: %s\n", desc->dev_name);
171 seq_printf(m, "status: 0x%08x\n", desc->status_use_accessors);
172 irq_debug_show_bits(m, 0, desc->status_use_accessors, irqdesc_states,
173 ARRAY_SIZE(irqdesc_states));
174 seq_printf(m, "istate: 0x%08x\n", desc->istate);
175 irq_debug_show_bits(m, 0, desc->istate, irqdesc_istates,
176 ARRAY_SIZE(irqdesc_istates));
177 seq_printf(m, "ddepth: %u\n", desc->depth);
178 seq_printf(m, "wdepth: %u\n", desc->wake_depth);
179 seq_printf(m, "dstate: 0x%08x\n", irqd_get(data));
180 irq_debug_show_bits(m, 0, irqd_get(data), irqdata_states,
181 ARRAY_SIZE(irqdata_states));
182 seq_printf(m, "node: %d\n", irq_data_get_node(data));
183 irq_debug_show_masks(m, desc);
184 irq_debug_show_data(m, data, 0);
185 raw_spin_unlock_irq(&desc->lock);
186 return 0;
187 }
188
irq_debug_open(struct inode * inode,struct file * file)189 static int irq_debug_open(struct inode *inode, struct file *file)
190 {
191 return single_open(file, irq_debug_show, inode->i_private);
192 }
193
irq_debug_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)194 static ssize_t irq_debug_write(struct file *file, const char __user *user_buf,
195 size_t count, loff_t *ppos)
196 {
197 struct irq_desc *desc = file_inode(file)->i_private;
198 char buf[8] = { 0, };
199 size_t size;
200
201 size = min(sizeof(buf) - 1, count);
202 if (copy_from_user(buf, user_buf, size))
203 return -EFAULT;
204
205 if (!strncmp(buf, "trigger", size)) {
206 int err = irq_inject_interrupt(irq_desc_get_irq(desc));
207
208 return err ? err : count;
209 }
210
211 return count;
212 }
213
214 static const struct file_operations dfs_irq_ops = {
215 .open = irq_debug_open,
216 .write = irq_debug_write,
217 .read = seq_read,
218 .llseek = seq_lseek,
219 .release = single_release,
220 };
221
irq_debugfs_copy_devname(int irq,struct device * dev)222 void irq_debugfs_copy_devname(int irq, struct device *dev)
223 {
224 struct irq_desc *desc = irq_to_desc(irq);
225 const char *name = dev_name(dev);
226
227 if (name)
228 desc->dev_name = kstrdup(name, GFP_KERNEL);
229 }
230
irq_add_debugfs_entry(unsigned int irq,struct irq_desc * desc)231 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc)
232 {
233 char name [10];
234
235 if (!irq_dir || !desc || desc->debugfs_file)
236 return;
237
238 sprintf(name, "%d", irq);
239 desc->debugfs_file = debugfs_create_file(name, 0644, irq_dir, desc,
240 &dfs_irq_ops);
241 }
242
irq_debugfs_init(void)243 static int __init irq_debugfs_init(void)
244 {
245 struct dentry *root_dir;
246 int irq;
247
248 root_dir = debugfs_create_dir("irq", NULL);
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