kernel/irq/debugfs.c

   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
  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
  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
  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
  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
  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         BIT_MASK_DESCR(IRQD_RESEND_WHEN_IN_PROGRESS),
 137 };
 138
 139 static const struct irq_bit_descr irqdesc_states[] = {
 140         BIT_MASK_DESCR(_IRQ_NOPROBE),
 141         BIT_MASK_DESCR(_IRQ_NOREQUEST),
 142         BIT_MASK_DESCR(_IRQ_NOTHREAD),
 143         BIT_MASK_DESCR(_IRQ_NOAUTOEN),
 144         BIT_MASK_DESCR(_IRQ_NESTED_THREAD),
 145         BIT_MASK_DESCR(_IRQ_PER_CPU_DEVID),
 146         BIT_MASK_DESCR(_IRQ_IS_POLLED),
 147         BIT_MASK_DESCR(_IRQ_DISABLE_UNLAZY),
 148         BIT_MASK_DESCR(_IRQ_HIDDEN),
 149 };
 150
 151 static const struct irq_bit_descr irqdesc_istates[] = {
 152         BIT_MASK_DESCR(IRQS_AUTODETECT),
 153         BIT_MASK_DESCR(IRQS_SPURIOUS_DISABLED),
 154         BIT_MASK_DESCR(IRQS_POLL_INPROGRESS),
 155         BIT_MASK_DESCR(IRQS_ONESHOT),
 156         BIT_MASK_DESCR(IRQS_REPLAY),
 157         BIT_MASK_DESCR(IRQS_WAITING),
 158         BIT_MASK_DESCR(IRQS_PENDING),
 159         BIT_MASK_DESCR(IRQS_SUSPENDED),
 160         BIT_MASK_DESCR(IRQS_NMI),
 161 };
 162
 163
 164 static int irq_debug_show(struct seq_file *m, void *p)
 165 {
 166         struct irq_desc *desc = m->private;
 167         struct irq_data *data;
 168
 169         raw_spin_lock_irq(&desc->lock);
 170         data = irq_desc_get_irq_data(desc);
 171         seq_printf(m, "handler:  %ps\n", desc->handle_irq);
 172         seq_printf(m, "device:   %s\n", desc->dev_name);
 173         seq_printf(m, "status:   0x%08x\n", desc->status_use_accessors);
 174         irq_debug_show_bits(m, 0, desc->status_use_accessors, irqdesc_states,
 175                             ARRAY_SIZE(irqdesc_states));
 176         seq_printf(m, "istate:   0x%08x\n", desc->istate);
 177         irq_debug_show_bits(m, 0, desc->istate, irqdesc_istates,
 178                             ARRAY_SIZE(irqdesc_istates));
 179         seq_printf(m, "ddepth:   %u\n", desc->depth);
 180         seq_printf(m, "wdepth:   %u\n", desc->wake_depth);
 181         seq_printf(m, "dstate:   0x%08x\n", irqd_get(data));
 182         irq_debug_show_bits(m, 0, irqd_get(data), irqdata_states,
 183                             ARRAY_SIZE(irqdata_states));
 184         seq_printf(m, "node:     %d\n", irq_data_get_node(data));
 185         irq_debug_show_masks(m, desc);
 186         irq_debug_show_data(m, data, 0);
 187         raw_spin_unlock_irq(&desc->lock);
 188         return 0;
 189 }
 190
 191 static int irq_debug_open(struct inode *inode, struct file *file)
 192 {
 193         return single_open(file, irq_debug_show, inode->i_private);
 194 }
 195
 196 static ssize_t irq_debug_write(struct file *file, const char __user *user_buf,
 197                                size_t count, loff_t *ppos)
 198 {
 199         struct irq_desc *desc = file_inode(file)->i_private;
 200         char buf[8] = { 0, };
 201         size_t size;
 202
 203         size = min(sizeof(buf) - 1, count);
 204         if (copy_from_user(buf, user_buf, size))
 205                 return -EFAULT;
 206
 207         if (!strncmp(buf, "trigger", size)) {
 208                 int err = irq_inject_interrupt(irq_desc_get_irq(desc));
 209
 210                 return err ? err : count;
 211         }
 212
 213         return count;
 214 }
 215
 216 static const struct file_operations dfs_irq_ops = {
 217         .open           = irq_debug_open,
 218         .write          = irq_debug_write,
 219         .read           = seq_read,
 220         .llseek         = seq_lseek,
 221         .release        = single_release,
 222 };
 223
 224 void irq_debugfs_copy_devname(int irq, struct device *dev)
 225 {
 226         struct irq_desc *desc = irq_to_desc(irq);
 227         const char *name = dev_name(dev);
 228
 229         if (name)
 230                 desc->dev_name = kstrdup(name, GFP_KERNEL);
 231 }
 232
 233 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc)
 234 {
 235         char name [10];
 236
 237         if (!irq_dir || !desc || desc->debugfs_file)
 238                 return;
 239
 240         sprintf(name, "%d", irq);
 241         desc->debugfs_file = debugfs_create_file(name, 0644, irq_dir, desc,
 242                                                  &dfs_irq_ops);
 243 }
 244
 245 static int __init irq_debugfs_init(void)
 246 {
 247         struct dentry *root_dir;
 248         int irq;
 249
 250         root_dir = debugfs_create_dir("irq", NULL);
 251
 252         irq_domain_debugfs_init(root_dir);
 253
 254         irq_dir = debugfs_create_dir("irqs", root_dir);
 255
 256         irq_lock_sparse();
 257         for_each_active_irq(irq)
 258                 irq_add_debugfs_entry(irq, irq_to_desc(irq));
 259         irq_unlock_sparse();
 260
 261         return 0;
 262 }
 263 __initcall(irq_debugfs_init);