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         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 };
  62
  63 static void
  64 irq_debug_show_chip(struct seq_file *m, struct irq_data *data, int ind)
  65 {
  66         struct irq_chip *chip = data->chip;
  67
  68         if (!chip) {
  69                 seq_printf(m, "chip: None\n");
  70                 return;
  71         }
  72         seq_printf(m, "%*schip:    %s\n", ind, "", chip->name);
  73         seq_printf(m, "%*sflags:   0x%lx\n", ind + 1, "", chip->flags);
  74         irq_debug_show_bits(m, ind, chip->flags, irqchip_flags,
  75                             ARRAY_SIZE(irqchip_flags));
  76 }
  77
  78 static void
  79 irq_debug_show_data(struct seq_file *m, struct irq_data *data, int ind)
  80 {
  81         seq_printf(m, "%*sdomain:  %s\n", ind, "",
  82                    data->domain ? data->domain->name : "");
  83         seq_printf(m, "%*shwirq:   0x%lx\n", ind + 1, "", data->hwirq);
  84         irq_debug_show_chip(m, data, ind + 1);
  85         if (data->domain && data->domain->ops && data->domain->ops->debug_show)
  86                 data->domain->ops->debug_show(m, NULL, data, ind + 1);
  87 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
  88         if (!data->parent_data)
  89                 return;
  90         seq_printf(m, "%*sparent:\n", ind + 1, "");
  91         irq_debug_show_data(m, data->parent_data, ind + 4);
  92 #endif
  93 }
  94
  95 static const struct irq_bit_descr irqdata_states[] = {
  96         BIT_MASK_DESCR(IRQ_TYPE_EDGE_RISING),
  97         BIT_MASK_DESCR(IRQ_TYPE_EDGE_FALLING),
  98         BIT_MASK_DESCR(IRQ_TYPE_LEVEL_HIGH),
  99         BIT_MASK_DESCR(IRQ_TYPE_LEVEL_LOW),
 100         BIT_MASK_DESCR(IRQD_LEVEL),
 101
 102         BIT_MASK_DESCR(IRQD_ACTIVATED),
 103         BIT_MASK_DESCR(IRQD_IRQ_STARTED),
 104         BIT_MASK_DESCR(IRQD_IRQ_DISABLED),
 105         BIT_MASK_DESCR(IRQD_IRQ_MASKED),
 106         BIT_MASK_DESCR(IRQD_IRQ_INPROGRESS),
 107
 108         BIT_MASK_DESCR(IRQD_PER_CPU),
 109         BIT_MASK_DESCR(IRQD_NO_BALANCING),
 110
 111         BIT_MASK_DESCR(IRQD_SINGLE_TARGET),
 112         BIT_MASK_DESCR(IRQD_MOVE_PCNTXT),
 113         BIT_MASK_DESCR(IRQD_AFFINITY_SET),
 114         BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING),
 115         BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED),
 116         BIT_MASK_DESCR(IRQD_AFFINITY_ON_ACTIVATE),
 117         BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN),
 118         BIT_MASK_DESCR(IRQD_CAN_RESERVE),
 119         BIT_MASK_DESCR(IRQD_MSI_NOMASK_QUIRK),
 120
 121         BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU),
 122
 123         BIT_MASK_DESCR(IRQD_WAKEUP_STATE),
 124         BIT_MASK_DESCR(IRQD_WAKEUP_ARMED),
 125
 126         BIT_MASK_DESCR(IRQD_DEFAULT_TRIGGER_SET),
 127
 128         BIT_MASK_DESCR(IRQD_HANDLE_ENFORCE_IRQCTX),
 129
 130         BIT_MASK_DESCR(IRQD_IRQ_ENABLED_ON_SUSPEND),
 131 };
 132
 133 static const struct irq_bit_descr irqdesc_states[] = {
 134         BIT_MASK_DESCR(_IRQ_NOPROBE),
 135         BIT_MASK_DESCR(_IRQ_NOREQUEST),
 136         BIT_MASK_DESCR(_IRQ_NOTHREAD),
 137         BIT_MASK_DESCR(_IRQ_NOAUTOEN),
 138         BIT_MASK_DESCR(_IRQ_NESTED_THREAD),
 139         BIT_MASK_DESCR(_IRQ_PER_CPU_DEVID),
 140         BIT_MASK_DESCR(_IRQ_IS_POLLED),
 141         BIT_MASK_DESCR(_IRQ_DISABLE_UNLAZY),
 142         BIT_MASK_DESCR(_IRQ_HIDDEN),
 143 };
 144
 145 static const struct irq_bit_descr irqdesc_istates[] = {
 146         BIT_MASK_DESCR(IRQS_AUTODETECT),
 147         BIT_MASK_DESCR(IRQS_SPURIOUS_DISABLED),
 148         BIT_MASK_DESCR(IRQS_POLL_INPROGRESS),
 149         BIT_MASK_DESCR(IRQS_ONESHOT),
 150         BIT_MASK_DESCR(IRQS_REPLAY),
 151         BIT_MASK_DESCR(IRQS_WAITING),
 152         BIT_MASK_DESCR(IRQS_PENDING),
 153         BIT_MASK_DESCR(IRQS_SUSPENDED),
 154         BIT_MASK_DESCR(IRQS_NMI),
 155 };
 156
 157
 158 static int irq_debug_show(struct seq_file *m, void *p)
 159 {
 160         struct irq_desc *desc = m->private;
 161         struct irq_data *data;
 162
 163         raw_spin_lock_irq(&desc->lock);
 164         data = irq_desc_get_irq_data(desc);
 165         seq_printf(m, "handler:  %ps\n", desc->handle_irq);
 166         seq_printf(m, "device:   %s\n", desc->dev_name);
 167         seq_printf(m, "status:   0x%08x\n", desc->status_use_accessors);
 168         irq_debug_show_bits(m, 0, desc->status_use_accessors, irqdesc_states,
 169                             ARRAY_SIZE(irqdesc_states));
 170         seq_printf(m, "istate:   0x%08x\n", desc->istate);
 171         irq_debug_show_bits(m, 0, desc->istate, irqdesc_istates,
 172                             ARRAY_SIZE(irqdesc_istates));
 173         seq_printf(m, "ddepth:   %u\n", desc->depth);
 174         seq_printf(m, "wdepth:   %u\n", desc->wake_depth);
 175         seq_printf(m, "dstate:   0x%08x\n", irqd_get(data));
 176         irq_debug_show_bits(m, 0, irqd_get(data), irqdata_states,
 177                             ARRAY_SIZE(irqdata_states));
 178         seq_printf(m, "node:     %d\n", irq_data_get_node(data));
 179         irq_debug_show_masks(m, desc);
 180         irq_debug_show_data(m, data, 0);
 181         raw_spin_unlock_irq(&desc->lock);
 182         return 0;
 183 }
 184
 185 static int irq_debug_open(struct inode *inode, struct file *file)
 186 {
 187         return single_open(file, irq_debug_show, inode->i_private);
 188 }
 189
 190 static ssize_t irq_debug_write(struct file *file, const char __user *user_buf,
 191                                size_t count, loff_t *ppos)
 192 {
 193         struct irq_desc *desc = file_inode(file)->i_private;
 194         char buf[8] = { 0, };
 195         size_t size;
 196
 197         size = min(sizeof(buf) - 1, count);
 198         if (copy_from_user(buf, user_buf, size))
 199                 return -EFAULT;
 200
 201         if (!strncmp(buf, "trigger", size)) {
 202                 int err = irq_inject_interrupt(irq_desc_get_irq(desc));
 203
 204                 return err ? err : count;
 205         }
 206
 207         return count;
 208 }
 209
 210 static const struct file_operations dfs_irq_ops = {
 211         .open           = irq_debug_open,
 212         .write          = irq_debug_write,
 213         .read           = seq_read,
 214         .llseek         = seq_lseek,
 215         .release        = single_release,
 216 };
 217
 218 void irq_debugfs_copy_devname(int irq, struct device *dev)
 219 {
 220         struct irq_desc *desc = irq_to_desc(irq);
 221         const char *name = dev_name(dev);
 222
 223         if (name)
 224                 desc->dev_name = kstrdup(name, GFP_KERNEL);
 225 }
 226
 227 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc)
 228 {
 229         char name [10];
 230
 231         if (!irq_dir || !desc || desc->debugfs_file)
 232                 return;
 233
 234         sprintf(name, "%d", irq);
 235         desc->debugfs_file = debugfs_create_file(name, 0644, irq_dir, desc,
 236                                                  &dfs_irq_ops);
 237 }
 238
 239 static int __init irq_debugfs_init(void)
 240 {
 241         struct dentry *root_dir;
 242         int irq;
 243
 244         root_dir = debugfs_create_dir("irq", NULL);
 245
 246         irq_domain_debugfs_init(root_dir);
 247
 248         irq_dir = debugfs_create_dir("irqs", root_dir);
 249
 250         irq_lock_sparse();
 251         for_each_active_irq(irq)
 252                 irq_add_debugfs_entry(irq, irq_to_desc(irq));
 253         irq_unlock_sparse();
 254
 255         return 0;
 256 }
 257 __initcall(irq_debugfs_init);